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Jan Kiszka fb51ccbf21 PCI: Rework config space blocking services 
pci_block_user_cfg_access was designed for the use case that a single
context, the IPR driver, temporarily delays user space accesses to the
config space via sysfs. This assumption became invalid by the time
pci_dev_reset was added as locking instance. Today, if you run two loops
in parallel that reset the same device via sysfs, you end up with a
kernel BUG as pci_block_user_cfg_access detect the broken assumption.

This reworks the pci_block_user_cfg_access to a sleeping service
pci_cfg_access_lock and an atomic-compatible variant called
pci_cfg_access_trylock. The former not only blocks user space access as
before but also waits if access was already locked. The latter service
just returns false in this case, allowing the caller to resolve the
conflict instead of raising a BUG.

Adaptions of the ipr driver were originally written by Brian King.

Acked-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
 		2012-01-06 12:10:33 -08:00
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accessibility
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acpi PCI: Rework ASPM disable code 2012-01-06 12:10:26 -08:00
amba
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ata pata_of_platform: Add missing CONFIG_OF_IRQ dependency. 2011-12-22 15:00:32 -05:00
atm
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auxdisplay
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base PM / Driver core: leave runtime PM enabled during system shutdown 2011-12-07 22:26:56 +01:00
bcma
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block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2011-12-16 10:05:14 -08:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2011-12-09 14:07:12 -05:00
cdrom
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char ipmi_watchdog: restore settings when BMC reset 2011-12-20 10:25:04 -08:00
clk
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clocksource Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
connector
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cpufreq [CPUFREQ] db8500: fix build error due to undeclared i variable 2011-11-11 22:28:33 -05:00
cpuidle Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2011-11-07 10:13:52 -08:00
crypto Merge git://github.com/herbertx/crypto 2011-11-25 21:55:07 -08:00
dca
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devfreq PM / devfreq: correct Kconfig dependency 2011-11-14 23:31:35 +01:00
dio
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dma dma: MX3_IPU fix depends 2011-12-19 12:26:07 +01:00
edac drivers/edac/mpc85xx_edac.c: fix memory controller compatible for edac 2011-11-24 01:59:38 -06:00
eisa
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firewire Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
firmware Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/ibft 2011-12-15 14:16:47 -08:00
gpio gpio: Fix DA9052 GPIO build errors. 2011-12-15 11:25:43 -07:00
gpu drm/radeon/kms/atom: fix possible segfault in pm setup 2012-01-03 09:17:16 +00:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2011-12-02 08:25:46 -08:00
hv
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hwmon hwmon: (jz4740) Staticise jz4740_hwmon_driver 2011-12-12 08:31:21 -08:00
hwspinlock Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-08 18:34:16 -08:00
i2c i2c-eg20t: correct the driver init order of pch_i2c_probe() 2011-12-18 11:46:42 +00:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide 2011-11-18 22:04:12 -02:00
idle Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2011-11-07 10:13:52 -08:00
ieee802154
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infiniband Merge branches 'cma', 'mlx4' and 'qib' into for-next 2011-12-19 09:19:49 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2011-12-30 13:42:41 -08:00
iommu Merge branch 'iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu 2011-12-29 17:36:15 -08:00
isdn isdn: avoid copying too long drvid 2011-11-29 18:39:37 -05:00
leds Revert "leds: save the delay values after a successful call to blink_set()" 2011-11-15 22:41:50 -02:00
lguest
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macintosh m68k/irq: Remove obsolete IRQ_FLG_* users 2011-11-08 22:35:48 +01:00
mca
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md md/bitmap: It is OK to clear bits during recovery. 2011-12-23 09:57:48 +11:00
media gspca: Fix falling back to lower isoc alt settings 2011-12-31 11:53:58 -08:00
memstick
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message
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mfd mfd: Include linux/io.h to jz4740-adc 2011-12-20 18:53:26 +01:00
misc Merge branch 'char-misc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc 2011-11-21 20:36:05 -08:00
mmc Merge branch 'fixes' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm 2011-12-30 13:45:34 -08:00
mtd mtd: plat_ram: call mtd_device_register only if partition data exists 2011-12-19 11:13:52 +00:00
net skge: restore rx multicast filter on resume and after config changes 2011-12-30 23:32:45 -05:00
nfc
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nubus
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of dt/device: Fix auxdata matching to handle entries without a name override 2011-12-12 14:41:45 -07:00
oprofile oprofile: Fix uninitialized memory access when writing to writing to oprofilefs 2011-12-19 17:18:43 +01:00
parisc
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parport
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pci PCI: Rework config space blocking services 2012-01-06 12:10:33 -08:00
pcmcia Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
pinctrl pinctrl: hide subsystem from the populace 2011-11-10 09:02:12 +01:00
platform toshiba_acpi: Fix machines that don't support HCI_SYSTEM_EVENT 2011-12-05 13:07:28 -05:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2011-11-07 10:13:52 -08:00
power x86/mrst: Battery fixes 2011-12-05 17:06:37 +01:00
pps
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ps3 powerpc/ps3: irq: Remove IRQF_DISABLED 2011-11-08 14:51:46 +11:00
ptp ptp: Fix clock_getres() implementation 2011-12-06 11:38:32 +01:00
rapidio rapidio/tsi721: modify PCIe capability settings 2011-12-09 07:50:29 -08:00
regulator regulator: twl: fix twl4030 support for smps regulators 2011-11-28 18:58:31 +00:00
rtc Revert "rtc: Expire alarms after the time is set." 2012-01-04 07:57:22 -08:00
s390 [SCSI] zfcp: return early from slave_destroy if slave_alloc returned early 2011-12-14 15:40:43 +04:00
sbus sbus: convert drivers/sbus/char/* to use module_platform_driver() 2011-12-04 10:46:58 -08:00
scsi PCI: Rework config space blocking services 2012-01-06 12:10:33 -08:00
sfi
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sh Merge branches 'sh/pm-runtime' and 'common/clkfwk' into sh-fixes-for-linus 2011-11-11 16:16:25 +09:00
sn
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spi spi/gpio: fix section mismatch warning 2011-12-07 22:17:39 +01:00
ssb Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2011-12-09 14:07:12 -05:00
staging staging: r8712u: Add new USB ID 2011-12-13 16:13:15 -08:00
target iscsi-target: Fix hex2bin warn_unused compile message 2011-12-06 06:00:59 +00:00
tc
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telephony
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thermal thermal: Prevent polling from happening during system suspend 2011-11-06 20:38:49 -05:00
tty Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty 2011-11-21 20:36:46 -08:00
uio PCI: Rework config space blocking services 2012-01-06 12:10:33 -08:00
usb Merge branch 'for-greg' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-linus 2011-12-21 14:42:49 -08:00
uwb
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vhost
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video viafb: correct sync polarity for OLPC DCON 2011-11-22 00:56:17 +00:00
virt
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virtio virtio-pci: make reset operation safer 2011-11-24 13:04:48 +10:30
vlynq
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w1 Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
watchdog watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing (part 2) 2011-12-27 20:35:59 +01:00
xen Revert "xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from old kernel" 2011-12-19 09:30:35 -05:00
zorro
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Kconfig
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Makefile
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