linux/net/bluetooth/hci_sysfs.c

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/* Bluetooth HCI driver model support. */
#include <linux/kernel.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
static struct class *bt_class;
struct dentry *bt_debugfs;
EXPORT_SYMBOL_GPL(bt_debugfs);
static inline char *link_typetostr(int type)
{
switch (type) {
case ACL_LINK:
return "ACL";
case SCO_LINK:
return "SCO";
case ESCO_LINK:
return "eSCO";
default:
return "UNKNOWN";
}
}
static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_conn *conn = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", link_typetostr(conn->type));
}
static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_conn *conn = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", batostr(&conn->dst));
}
static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_conn *conn = dev_get_drvdata(dev);
return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
conn->features[0], conn->features[1],
conn->features[2], conn->features[3],
conn->features[4], conn->features[5],
conn->features[6], conn->features[7]);
}
#define LINK_ATTR(_name, _mode, _show, _store) \
struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
static struct attribute *bt_link_attrs[] = {
&link_attr_type.attr,
&link_attr_address.attr,
&link_attr_features.attr,
NULL
};
static struct attribute_group bt_link_group = {
.attrs = bt_link_attrs,
};
static const struct attribute_group *bt_link_groups[] = {
&bt_link_group,
NULL
};
static void bt_link_release(struct device *dev)
{
void *data = dev_get_drvdata(dev);
kfree(data);
}
static struct device_type bt_link = {
.name = "link",
.groups = bt_link_groups,
.release = bt_link_release,
};
static void add_conn(struct work_struct *work)
{
struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
Bluetooth: Move dev_set_name() to a context that can sleep Setting the name of a sysfs device has to be done in a context that can actually sleep. It allocates its memory with GFP_KERNEL. Previously it was a static (size limited) string and that got changed to accommodate longer device names. So move the dev_set_name() just before calling device_add() which is executed in a work queue. This fixes the following error: [ 110.012125] BUG: sleeping function called from invalid context at mm/slub.c:1595 [ 110.012135] in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper [ 110.012141] 2 locks held by swapper/0: [ 110.012145] #0: (hci_task_lock){++.-.+}, at: [<ffffffffa01f822f>] hci_rx_task+0x2f/0x2d0 [bluetooth] [ 110.012173] #1: (&hdev->lock){+.-.+.}, at: [<ffffffffa01fb9e2>] hci_event_packet+0x72/0x25c0 [bluetooth] [ 110.012198] Pid: 0, comm: swapper Tainted: G W 2.6.30-rc4-g953cdaa #1 [ 110.012203] Call Trace: [ 110.012207] <IRQ> [<ffffffff8023eabd>] __might_sleep+0x14d/0x170 [ 110.012228] [<ffffffff802cfbe1>] __kmalloc+0x111/0x170 [ 110.012239] [<ffffffff803c2094>] kvasprintf+0x64/0xb0 [ 110.012248] [<ffffffff803b7a5b>] kobject_set_name_vargs+0x3b/0xa0 [ 110.012257] [<ffffffff80465326>] dev_set_name+0x76/0xa0 [ 110.012273] [<ffffffffa01fb9e2>] ? hci_event_packet+0x72/0x25c0 [bluetooth] [ 110.012289] [<ffffffffa01ffc1d>] hci_conn_add_sysfs+0x3d/0x70 [bluetooth] [ 110.012303] [<ffffffffa01fba2c>] hci_event_packet+0xbc/0x25c0 [bluetooth] [ 110.012312] [<ffffffff80516eb0>] ? sock_def_readable+0x80/0xa0 [ 110.012328] [<ffffffffa01fee0c>] ? hci_send_to_sock+0xfc/0x1c0 [bluetooth] [ 110.012343] [<ffffffff80516eb0>] ? sock_def_readable+0x80/0xa0 [ 110.012347] [<ffffffff805e88c5>] ? _read_unlock+0x75/0x80 [ 110.012354] [<ffffffffa01fee0c>] ? hci_send_to_sock+0xfc/0x1c0 [bluetooth] [ 110.012360] [<ffffffffa01f8403>] hci_rx_task+0x203/0x2d0 [bluetooth] [ 110.012365] [<ffffffff80250ab5>] tasklet_action+0xb5/0x160 [ 110.012369] [<ffffffff8025116c>] __do_softirq+0x9c/0x150 [ 110.012372] [<ffffffff805e850f>] ? _spin_unlock+0x3f/0x80 [ 110.012376] [<ffffffff8020cbbc>] call_softirq+0x1c/0x30 [ 110.012380] [<ffffffff8020f01d>] do_softirq+0x8d/0xe0 [ 110.012383] [<ffffffff80250df5>] irq_exit+0xc5/0xe0 [ 110.012386] [<ffffffff8020e71d>] do_IRQ+0x9d/0x120 [ 110.012389] [<ffffffff8020c3d3>] ret_from_intr+0x0/0xf [ 110.012391] <EOI> [<ffffffff80431832>] ? acpi_idle_enter_bm+0x264/0x2a6 [ 110.012399] [<ffffffff80431828>] ? acpi_idle_enter_bm+0x25a/0x2a6 [ 110.012403] [<ffffffff804f50d5>] ? cpuidle_idle_call+0xc5/0x130 [ 110.012407] [<ffffffff8020a4b4>] ? cpu_idle+0xc4/0x130 [ 110.012411] [<ffffffff805d2268>] ? rest_init+0x88/0xb0 [ 110.012416] [<ffffffff807e2fbd>] ? start_kernel+0x3b5/0x412 [ 110.012420] [<ffffffff807e2281>] ? x86_64_start_reservations+0x91/0xb5 [ 110.012424] [<ffffffff807e2394>] ? x86_64_start_kernel+0xef/0x11b Based on a report by Davide Pesavento <davidepesa@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Hugo Mildenberger <hugo.mildenberger@namir.de> Tested-by: Bing Zhao <bzhao@marvell.com>
2009-05-05 20:09:01 +00:00
struct hci_dev *hdev = conn->hdev;
Bluetooth: Move dev_set_name() to a context that can sleep Setting the name of a sysfs device has to be done in a context that can actually sleep. It allocates its memory with GFP_KERNEL. Previously it was a static (size limited) string and that got changed to accommodate longer device names. So move the dev_set_name() just before calling device_add() which is executed in a work queue. This fixes the following error: [ 110.012125] BUG: sleeping function called from invalid context at mm/slub.c:1595 [ 110.012135] in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper [ 110.012141] 2 locks held by swapper/0: [ 110.012145] #0: (hci_task_lock){++.-.+}, at: [<ffffffffa01f822f>] hci_rx_task+0x2f/0x2d0 [bluetooth] [ 110.012173] #1: (&hdev->lock){+.-.+.}, at: [<ffffffffa01fb9e2>] hci_event_packet+0x72/0x25c0 [bluetooth] [ 110.012198] Pid: 0, comm: swapper Tainted: G W 2.6.30-rc4-g953cdaa #1 [ 110.012203] Call Trace: [ 110.012207] <IRQ> [<ffffffff8023eabd>] __might_sleep+0x14d/0x170 [ 110.012228] [<ffffffff802cfbe1>] __kmalloc+0x111/0x170 [ 110.012239] [<ffffffff803c2094>] kvasprintf+0x64/0xb0 [ 110.012248] [<ffffffff803b7a5b>] kobject_set_name_vargs+0x3b/0xa0 [ 110.012257] [<ffffffff80465326>] dev_set_name+0x76/0xa0 [ 110.012273] [<ffffffffa01fb9e2>] ? hci_event_packet+0x72/0x25c0 [bluetooth] [ 110.012289] [<ffffffffa01ffc1d>] hci_conn_add_sysfs+0x3d/0x70 [bluetooth] [ 110.012303] [<ffffffffa01fba2c>] hci_event_packet+0xbc/0x25c0 [bluetooth] [ 110.012312] [<ffffffff80516eb0>] ? sock_def_readable+0x80/0xa0 [ 110.012328] [<ffffffffa01fee0c>] ? hci_send_to_sock+0xfc/0x1c0 [bluetooth] [ 110.012343] [<ffffffff80516eb0>] ? sock_def_readable+0x80/0xa0 [ 110.012347] [<ffffffff805e88c5>] ? _read_unlock+0x75/0x80 [ 110.012354] [<ffffffffa01fee0c>] ? hci_send_to_sock+0xfc/0x1c0 [bluetooth] [ 110.012360] [<ffffffffa01f8403>] hci_rx_task+0x203/0x2d0 [bluetooth] [ 110.012365] [<ffffffff80250ab5>] tasklet_action+0xb5/0x160 [ 110.012369] [<ffffffff8025116c>] __do_softirq+0x9c/0x150 [ 110.012372] [<ffffffff805e850f>] ? _spin_unlock+0x3f/0x80 [ 110.012376] [<ffffffff8020cbbc>] call_softirq+0x1c/0x30 [ 110.012380] [<ffffffff8020f01d>] do_softirq+0x8d/0xe0 [ 110.012383] [<ffffffff80250df5>] irq_exit+0xc5/0xe0 [ 110.012386] [<ffffffff8020e71d>] do_IRQ+0x9d/0x120 [ 110.012389] [<ffffffff8020c3d3>] ret_from_intr+0x0/0xf [ 110.012391] <EOI> [<ffffffff80431832>] ? acpi_idle_enter_bm+0x264/0x2a6 [ 110.012399] [<ffffffff80431828>] ? acpi_idle_enter_bm+0x25a/0x2a6 [ 110.012403] [<ffffffff804f50d5>] ? cpuidle_idle_call+0xc5/0x130 [ 110.012407] [<ffffffff8020a4b4>] ? cpu_idle+0xc4/0x130 [ 110.012411] [<ffffffff805d2268>] ? rest_init+0x88/0xb0 [ 110.012416] [<ffffffff807e2fbd>] ? start_kernel+0x3b5/0x412 [ 110.012420] [<ffffffff807e2281>] ? x86_64_start_reservations+0x91/0xb5 [ 110.012424] [<ffffffff807e2394>] ? x86_64_start_kernel+0xef/0x11b Based on a report by Davide Pesavento <davidepesa@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Hugo Mildenberger <hugo.mildenberger@namir.de> Tested-by: Bing Zhao <bzhao@marvell.com>
2009-05-05 20:09:01 +00:00
dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
bluetooth: scheduling while atomic bug fix Due to driver core changes dev_set_drvdata will call kzalloc which should be in might_sleep context, but hci_conn_add will be called in atomic context Like dev_set_name move dev_set_drvdata to work queue function. oops as following: Oct 2 17:41:59 darkstar kernel: [ 438.001341] BUG: sleeping function called from invalid context at mm/slqb.c:1546 Oct 2 17:41:59 darkstar kernel: [ 438.001345] in_atomic(): 1, irqs_disabled(): 0, pid: 2133, name: sdptool Oct 2 17:41:59 darkstar kernel: [ 438.001348] 2 locks held by sdptool/2133: Oct 2 17:41:59 darkstar kernel: [ 438.001350] #0: (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.+.}, at: [<faa1d2f5>] lock_sock+0xa/0xc [l2cap] Oct 2 17:41:59 darkstar kernel: [ 438.001360] #1: (&hdev->lock){+.-.+.}, at: [<faa20e16>] l2cap_sock_connect+0x103/0x26b [l2cap] Oct 2 17:41:59 darkstar kernel: [ 438.001371] Pid: 2133, comm: sdptool Not tainted 2.6.31-mm1 #2 Oct 2 17:41:59 darkstar kernel: [ 438.001373] Call Trace: Oct 2 17:41:59 darkstar kernel: [ 438.001381] [<c022433f>] __might_sleep+0xde/0xe5 Oct 2 17:41:59 darkstar kernel: [ 438.001386] [<c0298843>] __kmalloc+0x4a/0x15a Oct 2 17:41:59 darkstar kernel: [ 438.001392] [<c03f0065>] ? kzalloc+0xb/0xd Oct 2 17:41:59 darkstar kernel: [ 438.001396] [<c03f0065>] kzalloc+0xb/0xd Oct 2 17:41:59 darkstar kernel: [ 438.001400] [<c03f04ff>] device_private_init+0x15/0x3d Oct 2 17:41:59 darkstar kernel: [ 438.001405] [<c03f24c5>] dev_set_drvdata+0x18/0x26 Oct 2 17:41:59 darkstar kernel: [ 438.001414] [<fa51fff7>] hci_conn_init_sysfs+0x40/0xd9 [bluetooth] Oct 2 17:41:59 darkstar kernel: [ 438.001422] [<fa51cdc0>] ? hci_conn_add+0x128/0x186 [bluetooth] Oct 2 17:41:59 darkstar kernel: [ 438.001429] [<fa51ce0f>] hci_conn_add+0x177/0x186 [bluetooth] Oct 2 17:41:59 darkstar kernel: [ 438.001437] [<fa51cf8a>] hci_connect+0x3c/0xfb [bluetooth] Oct 2 17:41:59 darkstar kernel: [ 438.001442] [<faa20e87>] l2cap_sock_connect+0x174/0x26b [l2cap] Oct 2 17:41:59 darkstar kernel: [ 438.001448] [<c04c8df5>] sys_connect+0x60/0x7a Oct 2 17:41:59 darkstar kernel: [ 438.001453] [<c024b703>] ? lock_release_non_nested+0x84/0x1de Oct 2 17:41:59 darkstar kernel: [ 438.001458] [<c028804b>] ? might_fault+0x47/0x81 Oct 2 17:41:59 darkstar kernel: [ 438.001462] [<c028804b>] ? might_fault+0x47/0x81 Oct 2 17:41:59 darkstar kernel: [ 438.001468] [<c033361f>] ? __copy_from_user_ll+0x11/0xce Oct 2 17:41:59 darkstar kernel: [ 438.001472] [<c04c9419>] sys_socketcall+0x82/0x17b Oct 2 17:41:59 darkstar kernel: [ 438.001477] [<c020329d>] syscall_call+0x7/0xb Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-18 20:24:41 +00:00
dev_set_drvdata(&conn->dev, conn);
if (device_add(&conn->dev) < 0) {
BT_ERR("Failed to register connection device");
return;
}
hci_dev_hold(hdev);
}
/*
* The rfcomm tty device will possibly retain even when conn
* is down, and sysfs doesn't support move zombie device,
* so we should move the device before conn device is destroyed.
*/
static int __match_tty(struct device *dev, void *data)
{
return !strncmp(dev_name(dev), "rfcomm", 6);
}
static void del_conn(struct work_struct *work)
{
struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
struct hci_dev *hdev = conn->hdev;
Bluetooth: Fix issue with sysfs handling for connections Due to a semantic changes in flush_workqueue() the current approach of synchronizing the sysfs handling for connections doesn't work anymore. The whole approach is actually fully broken and based on assumptions that are no longer valid. With the introduction of Simple Pairing support, the creation of low-level ACL links got changed. This change invalidates the reason why in the past two independent work queues have been used for adding/removing sysfs devices. The adding of the actual sysfs device is now postponed until the host controller successfully assigns an unique handle to that link. So the real synchronization happens inside the controller and not the host. The only left-over problem is that some internals of the sysfs device handling are not initialized ahead of time. This leaves potential access to invalid data and can cause various NULL pointer dereferences. To fix this a new function makes sure that all sysfs details are initialized when an connection attempt is made. The actual sysfs device is only registered when the connection has been successfully established. To avoid a race condition with the registration, the check if a device is registered has been moved into the removal work. As an extra protection two flush_work() calls are left in place to make sure a previous add/del work has been completed first. Based on a report by Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Justin P. Mattock <justinmattock@gmail.com> Tested-by: Roger Quadros <ext-roger.quadros@nokia.com> Tested-by: Marc Pignat <marc.pignat@hevs.ch>
2009-05-03 01:24:06 +00:00
if (!device_is_registered(&conn->dev))
return;
while (1) {
struct device *dev;
dev = device_find_child(&conn->dev, NULL, __match_tty);
if (!dev)
break;
device_move(dev, NULL, DPM_ORDER_DEV_LAST);
put_device(dev);
}
device_del(&conn->dev);
put_device(&conn->dev);
hci_dev_put(hdev);
}
Bluetooth: Fix issue with sysfs handling for connections Due to a semantic changes in flush_workqueue() the current approach of synchronizing the sysfs handling for connections doesn't work anymore. The whole approach is actually fully broken and based on assumptions that are no longer valid. With the introduction of Simple Pairing support, the creation of low-level ACL links got changed. This change invalidates the reason why in the past two independent work queues have been used for adding/removing sysfs devices. The adding of the actual sysfs device is now postponed until the host controller successfully assigns an unique handle to that link. So the real synchronization happens inside the controller and not the host. The only left-over problem is that some internals of the sysfs device handling are not initialized ahead of time. This leaves potential access to invalid data and can cause various NULL pointer dereferences. To fix this a new function makes sure that all sysfs details are initialized when an connection attempt is made. The actual sysfs device is only registered when the connection has been successfully established. To avoid a race condition with the registration, the check if a device is registered has been moved into the removal work. As an extra protection two flush_work() calls are left in place to make sure a previous add/del work has been completed first. Based on a report by Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Justin P. Mattock <justinmattock@gmail.com> Tested-by: Roger Quadros <ext-roger.quadros@nokia.com> Tested-by: Marc Pignat <marc.pignat@hevs.ch>
2009-05-03 01:24:06 +00:00
void hci_conn_init_sysfs(struct hci_conn *conn)
{
Bluetooth: Fix issue with sysfs handling for connections Due to a semantic changes in flush_workqueue() the current approach of synchronizing the sysfs handling for connections doesn't work anymore. The whole approach is actually fully broken and based on assumptions that are no longer valid. With the introduction of Simple Pairing support, the creation of low-level ACL links got changed. This change invalidates the reason why in the past two independent work queues have been used for adding/removing sysfs devices. The adding of the actual sysfs device is now postponed until the host controller successfully assigns an unique handle to that link. So the real synchronization happens inside the controller and not the host. The only left-over problem is that some internals of the sysfs device handling are not initialized ahead of time. This leaves potential access to invalid data and can cause various NULL pointer dereferences. To fix this a new function makes sure that all sysfs details are initialized when an connection attempt is made. The actual sysfs device is only registered when the connection has been successfully established. To avoid a race condition with the registration, the check if a device is registered has been moved into the removal work. As an extra protection two flush_work() calls are left in place to make sure a previous add/del work has been completed first. Based on a report by Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Justin P. Mattock <justinmattock@gmail.com> Tested-by: Roger Quadros <ext-roger.quadros@nokia.com> Tested-by: Marc Pignat <marc.pignat@hevs.ch>
2009-05-03 01:24:06 +00:00
struct hci_dev *hdev = conn->hdev;
BT_DBG("conn %p", conn);
Bluetooth: Fix issue with sysfs handling for connections Due to a semantic changes in flush_workqueue() the current approach of synchronizing the sysfs handling for connections doesn't work anymore. The whole approach is actually fully broken and based on assumptions that are no longer valid. With the introduction of Simple Pairing support, the creation of low-level ACL links got changed. This change invalidates the reason why in the past two independent work queues have been used for adding/removing sysfs devices. The adding of the actual sysfs device is now postponed until the host controller successfully assigns an unique handle to that link. So the real synchronization happens inside the controller and not the host. The only left-over problem is that some internals of the sysfs device handling are not initialized ahead of time. This leaves potential access to invalid data and can cause various NULL pointer dereferences. To fix this a new function makes sure that all sysfs details are initialized when an connection attempt is made. The actual sysfs device is only registered when the connection has been successfully established. To avoid a race condition with the registration, the check if a device is registered has been moved into the removal work. As an extra protection two flush_work() calls are left in place to make sure a previous add/del work has been completed first. Based on a report by Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Justin P. Mattock <justinmattock@gmail.com> Tested-by: Roger Quadros <ext-roger.quadros@nokia.com> Tested-by: Marc Pignat <marc.pignat@hevs.ch>
2009-05-03 01:24:06 +00:00
conn->dev.type = &bt_link;
conn->dev.class = bt_class;
conn->dev.parent = &hdev->dev;
device_initialize(&conn->dev);
INIT_WORK(&conn->work_add, add_conn);
INIT_WORK(&conn->work_del, del_conn);
Bluetooth: Fix issue with sysfs handling for connections Due to a semantic changes in flush_workqueue() the current approach of synchronizing the sysfs handling for connections doesn't work anymore. The whole approach is actually fully broken and based on assumptions that are no longer valid. With the introduction of Simple Pairing support, the creation of low-level ACL links got changed. This change invalidates the reason why in the past two independent work queues have been used for adding/removing sysfs devices. The adding of the actual sysfs device is now postponed until the host controller successfully assigns an unique handle to that link. So the real synchronization happens inside the controller and not the host. The only left-over problem is that some internals of the sysfs device handling are not initialized ahead of time. This leaves potential access to invalid data and can cause various NULL pointer dereferences. To fix this a new function makes sure that all sysfs details are initialized when an connection attempt is made. The actual sysfs device is only registered when the connection has been successfully established. To avoid a race condition with the registration, the check if a device is registered has been moved into the removal work. As an extra protection two flush_work() calls are left in place to make sure a previous add/del work has been completed first. Based on a report by Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Justin P. Mattock <justinmattock@gmail.com> Tested-by: Roger Quadros <ext-roger.quadros@nokia.com> Tested-by: Marc Pignat <marc.pignat@hevs.ch>
2009-05-03 01:24:06 +00:00
}
void hci_conn_add_sysfs(struct hci_conn *conn)
{
BT_DBG("conn %p", conn);
queue_work(conn->hdev->workqueue, &conn->work_add);
Bluetooth: Fix issue with sysfs handling for connections Due to a semantic changes in flush_workqueue() the current approach of synchronizing the sysfs handling for connections doesn't work anymore. The whole approach is actually fully broken and based on assumptions that are no longer valid. With the introduction of Simple Pairing support, the creation of low-level ACL links got changed. This change invalidates the reason why in the past two independent work queues have been used for adding/removing sysfs devices. The adding of the actual sysfs device is now postponed until the host controller successfully assigns an unique handle to that link. So the real synchronization happens inside the controller and not the host. The only left-over problem is that some internals of the sysfs device handling are not initialized ahead of time. This leaves potential access to invalid data and can cause various NULL pointer dereferences. To fix this a new function makes sure that all sysfs details are initialized when an connection attempt is made. The actual sysfs device is only registered when the connection has been successfully established. To avoid a race condition with the registration, the check if a device is registered has been moved into the removal work. As an extra protection two flush_work() calls are left in place to make sure a previous add/del work has been completed first. Based on a report by Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Tested-by: Justin P. Mattock <justinmattock@gmail.com> Tested-by: Roger Quadros <ext-roger.quadros@nokia.com> Tested-by: Marc Pignat <marc.pignat@hevs.ch>
2009-05-03 01:24:06 +00:00
}
void hci_conn_del_sysfs(struct hci_conn *conn)
{
BT_DBG("conn %p", conn);
queue_work(conn->hdev->workqueue, &conn->work_del);
}
static inline char *host_bustostr(int bus)
{
switch (bus) {
case HCI_VIRTUAL:
return "VIRTUAL";
case HCI_USB:
return "USB";
case HCI_PCCARD:
return "PCCARD";
case HCI_UART:
return "UART";
case HCI_RS232:
return "RS232";
case HCI_PCI:
return "PCI";
case HCI_SDIO:
return "SDIO";
default:
return "UNKNOWN";
}
}
static inline char *host_typetostr(int type)
{
switch (type) {
case HCI_BREDR:
return "BR/EDR";
case HCI_AMP:
return "AMP";
default:
return "UNKNOWN";
}
}
static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
}
static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
}
static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
char name[HCI_MAX_NAME_LENGTH + 1];
int i;
for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
name[i] = hdev->dev_name[i];
name[HCI_MAX_NAME_LENGTH] = '\0';
return sprintf(buf, "%s\n", name);
}
static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "0x%.2x%.2x%.2x\n",
hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
}
static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", batostr(&hdev->bdaddr));
}
static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
hdev->features[0], hdev->features[1],
hdev->features[2], hdev->features[3],
hdev->features[4], hdev->features[5],
hdev->features[6], hdev->features[7]);
}
static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", hdev->manufacturer);
}
static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", hdev->hci_ver);
}
static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", hdev->hci_rev);
}
static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", hdev->idle_timeout);
}
static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
unsigned int val;
int rv;
rv = kstrtouint(buf, 0, &val);
if (rv < 0)
return rv;
if (val != 0 && (val < 500 || val > 3600000))
return -EINVAL;
hdev->idle_timeout = val;
return count;
}
static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", hdev->sniff_max_interval);
}
static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
u16 val;
int rv;
rv = kstrtou16(buf, 0, &val);
if (rv < 0)
return rv;
if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
return -EINVAL;
hdev->sniff_max_interval = val;
return count;
}
static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", hdev->sniff_min_interval);
}
static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct hci_dev *hdev = dev_get_drvdata(dev);
u16 val;
int rv;
rv = kstrtou16(buf, 0, &val);
if (rv < 0)
return rv;
if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
return -EINVAL;
hdev->sniff_min_interval = val;
return count;
}
static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
show_idle_timeout, store_idle_timeout);
static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
show_sniff_max_interval, store_sniff_max_interval);
static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
show_sniff_min_interval, store_sniff_min_interval);
static struct attribute *bt_host_attrs[] = {
&dev_attr_bus.attr,
&dev_attr_type.attr,
&dev_attr_name.attr,
&dev_attr_class.attr,
&dev_attr_address.attr,
&dev_attr_features.attr,
&dev_attr_manufacturer.attr,
&dev_attr_hci_version.attr,
&dev_attr_hci_revision.attr,
&dev_attr_idle_timeout.attr,
&dev_attr_sniff_max_interval.attr,
&dev_attr_sniff_min_interval.attr,
NULL
};
static struct attribute_group bt_host_group = {
.attrs = bt_host_attrs,
};
static const struct attribute_group *bt_host_groups[] = {
&bt_host_group,
NULL
};
static void bt_host_release(struct device *dev)
{
void *data = dev_get_drvdata(dev);
kfree(data);
}
static struct device_type bt_host = {
.name = "host",
.groups = bt_host_groups,
.release = bt_host_release,
};
static int inquiry_cache_show(struct seq_file *f, void *p)
{
struct hci_dev *hdev = f->private;
struct inquiry_cache *cache = &hdev->inq_cache;
struct inquiry_entry *e;
hci_dev_lock_bh(hdev);
for (e = cache->list; e; e = e->next) {
struct inquiry_data *data = &e->data;
seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
batostr(&data->bdaddr),
data->pscan_rep_mode, data->pscan_period_mode,
data->pscan_mode, data->dev_class[2],
data->dev_class[1], data->dev_class[0],
__le16_to_cpu(data->clock_offset),
data->rssi, data->ssp_mode, e->timestamp);
}
hci_dev_unlock_bh(hdev);
return 0;
}
static int inquiry_cache_open(struct inode *inode, struct file *file)
{
return single_open(file, inquiry_cache_show, inode->i_private);
}
static const struct file_operations inquiry_cache_fops = {
.open = inquiry_cache_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int blacklist_show(struct seq_file *f, void *p)
{
struct hci_dev *hdev = f->private;
struct list_head *l;
hci_dev_lock_bh(hdev);
list_for_each(l, &hdev->blacklist) {
struct bdaddr_list *b;
b = list_entry(l, struct bdaddr_list, list);
seq_printf(f, "%s\n", batostr(&b->bdaddr));
}
hci_dev_unlock_bh(hdev);
return 0;
}
static int blacklist_open(struct inode *inode, struct file *file)
{
return single_open(file, blacklist_show, inode->i_private);
}
static const struct file_operations blacklist_fops = {
.open = blacklist_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void print_bt_uuid(struct seq_file *f, u8 *uuid)
{
u32 data0, data4;
u16 data1, data2, data3, data5;
memcpy(&data0, &uuid[0], 4);
memcpy(&data1, &uuid[4], 2);
memcpy(&data2, &uuid[6], 2);
memcpy(&data3, &uuid[8], 2);
memcpy(&data4, &uuid[10], 4);
memcpy(&data5, &uuid[14], 2);
seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n",
ntohl(data0), ntohs(data1), ntohs(data2),
ntohs(data3), ntohl(data4), ntohs(data5));
}
static int uuids_show(struct seq_file *f, void *p)
{
struct hci_dev *hdev = f->private;
struct list_head *l;
hci_dev_lock_bh(hdev);
list_for_each(l, &hdev->uuids) {
struct bt_uuid *uuid;
uuid = list_entry(l, struct bt_uuid, list);
print_bt_uuid(f, uuid->uuid);
}
hci_dev_unlock_bh(hdev);
return 0;
}
static int uuids_open(struct inode *inode, struct file *file)
{
return single_open(file, uuids_show, inode->i_private);
}
static const struct file_operations uuids_fops = {
.open = uuids_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int auto_accept_delay_set(void *data, u64 val)
{
struct hci_dev *hdev = data;
hci_dev_lock_bh(hdev);
hdev->auto_accept_delay = val;
hci_dev_unlock_bh(hdev);
return 0;
}
static int auto_accept_delay_get(void *data, u64 *val)
{
struct hci_dev *hdev = data;
hci_dev_lock_bh(hdev);
*val = hdev->auto_accept_delay;
hci_dev_unlock_bh(hdev);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
auto_accept_delay_set, "%llu\n");
int hci_register_sysfs(struct hci_dev *hdev)
{
struct device *dev = &hdev->dev;
int err;
BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
dev->type = &bt_host;
dev->class = bt_class;
dev->parent = hdev->parent;
dev_set_name(dev, "%s", hdev->name);
dev_set_drvdata(dev, hdev);
err = device_register(dev);
if (err < 0)
return err;
if (!bt_debugfs)
return 0;
hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
if (!hdev->debugfs)
return 0;
debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
hdev, &inquiry_cache_fops);
debugfs_create_file("blacklist", 0444, hdev->debugfs,
hdev, &blacklist_fops);
debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
&auto_accept_delay_fops);
return 0;
}
void hci_unregister_sysfs(struct hci_dev *hdev)
{
BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
debugfs_remove_recursive(hdev->debugfs);
device_del(&hdev->dev);
}
int __init bt_sysfs_init(void)
{
bt_debugfs = debugfs_create_dir("bluetooth", NULL);
bt_class = class_create(THIS_MODULE, "bluetooth");
if (IS_ERR(bt_class))
return PTR_ERR(bt_class);
return 0;
}
void bt_sysfs_cleanup(void)
{
class_destroy(bt_class);
debugfs_remove_recursive(bt_debugfs);
}