46c501473d
All the entry points into the TX module should check if the device has been torn down. Otherwise, when the device resets or shuts down, there are windows when a call to i2400m_tx*() will oops the system. For that, make i2400m_tx_release() set i2400m->tx_buf to NULL under the tx_lock. Then, any entry point [i2400m_tx(), _tx_msg_sent(), _tx_msg_get()] will check for i2400m->tx_buf to be NULL and exit gracefully. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
156 lines
4.9 KiB
C
156 lines
4.9 KiB
C
/*
|
|
* Intel Wireless WiMAX Connection 2400m
|
|
* SDIO TX transaction backends
|
|
*
|
|
*
|
|
* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name of Intel Corporation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*
|
|
* Intel Corporation <linux-wimax@intel.com>
|
|
* Dirk Brandewie <dirk.j.brandewie@intel.com>
|
|
* - Initial implementation
|
|
*
|
|
*
|
|
* Takes the TX messages in the i2400m's driver TX FIFO and sends them
|
|
* to the device until there are no more.
|
|
*
|
|
* If we fail sending the message, we just drop it. There isn't much
|
|
* we can do at this point. Most of the traffic is network, which has
|
|
* recovery methods for dropped packets.
|
|
*
|
|
* The SDIO functions are not atomic, so we can't run from the context
|
|
* where i2400m->bus_tx_kick() [i2400ms_bus_tx_kick()] is being called
|
|
* (some times atomic). Thus, the actual TX work is deferred to a
|
|
* workqueue.
|
|
*
|
|
* ROADMAP
|
|
*
|
|
* i2400ms_bus_tx_kick()
|
|
* i2400ms_tx_submit() [through workqueue]
|
|
*
|
|
* i2400m_tx_setup()
|
|
*
|
|
* i2400m_tx_release()
|
|
*/
|
|
#include <linux/mmc/sdio_func.h>
|
|
#include "i2400m-sdio.h"
|
|
|
|
#define D_SUBMODULE tx
|
|
#include "sdio-debug-levels.h"
|
|
|
|
|
|
/*
|
|
* Pull TX transations from the TX FIFO and send them to the device
|
|
* until there are no more.
|
|
*/
|
|
static
|
|
void i2400ms_tx_submit(struct work_struct *ws)
|
|
{
|
|
int result;
|
|
struct i2400ms *i2400ms = container_of(ws, struct i2400ms, tx_worker);
|
|
struct i2400m *i2400m = &i2400ms->i2400m;
|
|
struct sdio_func *func = i2400ms->func;
|
|
struct device *dev = &func->dev;
|
|
struct i2400m_msg_hdr *tx_msg;
|
|
size_t tx_msg_size;
|
|
|
|
d_fnstart(4, dev, "(i2400ms %p, i2400m %p)\n", i2400ms, i2400ms);
|
|
|
|
while (NULL != (tx_msg = i2400m_tx_msg_get(i2400m, &tx_msg_size))) {
|
|
d_printf(2, dev, "TX: submitting %zu bytes\n", tx_msg_size);
|
|
d_dump(5, dev, tx_msg, tx_msg_size);
|
|
|
|
sdio_claim_host(func);
|
|
result = sdio_memcpy_toio(func, 0, tx_msg, tx_msg_size);
|
|
sdio_release_host(func);
|
|
|
|
i2400m_tx_msg_sent(i2400m);
|
|
|
|
if (result < 0) {
|
|
dev_err(dev, "TX: cannot submit TX; tx_msg @%zu %zu B:"
|
|
" %d\n", (void *) tx_msg - i2400m->tx_buf,
|
|
tx_msg_size, result);
|
|
}
|
|
|
|
d_printf(2, dev, "TX: %zub submitted\n", tx_msg_size);
|
|
}
|
|
|
|
d_fnend(4, dev, "(i2400ms %p) = void\n", i2400ms);
|
|
}
|
|
|
|
|
|
/*
|
|
* The generic driver notifies us that there is data ready for TX
|
|
*
|
|
* Schedule a run of i2400ms_tx_submit() to handle it.
|
|
*/
|
|
void i2400ms_bus_tx_kick(struct i2400m *i2400m)
|
|
{
|
|
struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
|
|
struct device *dev = &i2400ms->func->dev;
|
|
|
|
d_fnstart(3, dev, "(i2400m %p) = void\n", i2400m);
|
|
|
|
/* schedule tx work, this is because tx may block, therefore
|
|
* it has to run in a thread context.
|
|
*/
|
|
queue_work(i2400ms->tx_workqueue, &i2400ms->tx_worker);
|
|
|
|
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
|
|
}
|
|
|
|
int i2400ms_tx_setup(struct i2400ms *i2400ms)
|
|
{
|
|
int result;
|
|
struct device *dev = &i2400ms->func->dev;
|
|
struct i2400m *i2400m = &i2400ms->i2400m;
|
|
|
|
d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
|
|
|
|
INIT_WORK(&i2400ms->tx_worker, i2400ms_tx_submit);
|
|
snprintf(i2400ms->tx_wq_name, sizeof(i2400ms->tx_wq_name),
|
|
"%s-tx", i2400m->wimax_dev.name);
|
|
i2400ms->tx_workqueue =
|
|
create_singlethread_workqueue(i2400ms->tx_wq_name);
|
|
if (NULL == i2400ms->tx_workqueue) {
|
|
dev_err(dev, "TX: failed to create workqueue\n");
|
|
result = -ENOMEM;
|
|
} else
|
|
result = 0;
|
|
d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
|
|
return result;
|
|
}
|
|
|
|
void i2400ms_tx_release(struct i2400ms *i2400ms)
|
|
{
|
|
if (i2400ms->tx_workqueue) {
|
|
destroy_workqueue(i2400ms->tx_workqueue);
|
|
i2400ms->tx_workqueue = NULL;
|
|
}
|
|
}
|