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Jonathan Nieder 8a317a8760 [media] cx88: protect per-device driver list with device lock 
The BKL conversion of this driver seems to have gone wrong.  Various
uses of the sub-device and driver lists appear to be subject to race
conditions.

In particular, some functions access drvlist without a relevant lock
held, which will race against removal of drivers.  Let's start with
that --- clean up by consistently protecting dev->drvlist with
dev->core->lock, noting driver functions that require the device lock
to be held or not to be held.

After this patch, there are still some races --- e.g.,
cx8802_blackbird_remove can run between the time the blackbird driver
is acquired and the time it is used in mpeg_release, and there's a
similar race in cx88_dvb_bus_ctrl.  Later patches will address the
remaining known races and the deadlock noticed by Andi.  This patch
just makes the semantics clearer in preparation for those later
changes.

Based on work by Ben Hutchings <ben@decadent.org.uk>.

Tested-by: Andi Huber <hobrom@gmx.at>
Tested-by: Marlon de Boer <marlon@hyves.nl>
Cc: stable@kernel.org
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-20 09:29:34 -03:00
..
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acpi ACPI / PM: Avoid infinite recurrence while registering power resources 2011-04-26 11:33:18 +02:00
amba PM / Hibernate: Introduce CONFIG_HIBERNATE_CALLBACKS 2011-04-11 22:54:42 +02:00
ata Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev 2011-05-14 12:19:18 -07:00
atm drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
auxdisplay Fix common misspellings 2011-03-31 11:26:23 -03:00
base PM / Wakeup: Fix initialization of wakeup-related device sysfs files 2011-04-26 11:33:09 +02:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2011-05-18 06:49:02 -07:00
bluetooth Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
cdrom cdrom: always check_disk_change() on open 2011-04-29 10:17:25 +02:00
char drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
clk CLKDEV: Fix clkdev return value for NULL clk case 2011-04-30 10:14:08 +01:00
clocksource
connector connector: fix skb double free in cn_rx_skb() 2011-04-12 14:38:57 -07:00
cpufreq Fix common misspellings 2011-03-31 11:26:23 -03:00
cpuidle
crypto Fix common misspellings 2011-03-31 11:26:23 -03:00
dca drivers/dca/dca-core.c: use list_move() instead of list_del()/list_add() combination 2011-03-22 17:44:12 -07:00
dio
dma Merge branch 'spi/merge' of git://git.secretlab.ca/git/linux-2.6 2011-04-11 15:44:38 -07:00
edac drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
eisa
firewire Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2011-05-04 14:21:39 -07:00
firmware sigma-firmware: loader for Analog Devices' SigmaStudio 2011-03-22 17:44:15 -07:00
gpio Merge branch 'spi/merge' of git://git.secretlab.ca/git/linux-2.6 2011-04-11 15:44:38 -07:00
gpu drm: Take lock around probes for drm_fb_helper_hotplug_event 2011-05-16 12:01:43 +10:00
hid Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
hwmon hwmon: (twl4030-madc-hwmon) Return proper error if hwmon_device_register fails 2011-05-01 09:06:35 -07:00
hwspinlock
i2c drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
ide ide: unexport DISK_EVENT_MEDIA_CHANGE for ide-gd and ide-cd 2011-04-21 19:43:59 +02:00
idle
ieee802154
infiniband Revert wrong fixes for common misspellings 2011-04-26 23:31:11 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2011-05-12 10:41:31 -07:00
isdn Fix common misspellings 2011-03-31 11:26:23 -03:00
leds drivers/leds/leds-lm3530.c: add MODULE_DEVICE_TABLE 2011-05-18 02:55:22 -07:00
lguest Fix common misspellings 2011-03-31 11:26:23 -03:00
macintosh Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
mca
md raid5: fix build error, sector_t usage 2011-04-21 10:00:00 -07:00
media [media] cx88: protect per-device driver list with device lock 2011-05-20 09:29:34 -03:00
memstick Fix common misspellings 2011-03-31 11:26:23 -03:00
message block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers 2011-04-21 21:33:05 +02:00
mfd mfd: Fix for the TWL4030 PM sleep/wakeup sequence 2011-05-11 11:09:58 +02:00
misc drivers/misc/sgi-gru/grufile.c: fix the wrong members of gru_chip 2011-04-14 16:06:55 -07:00
mmc drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
mtd drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
net drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
nfc
nubus
of Fix common misspellings 2011-03-31 11:26:23 -03:00
oprofile
parisc Fix common misspellings 2011-03-31 11:26:23 -03:00
parport parport_pc.c: correctly release the requested region for the IT887x 2011-04-19 16:36:24 -07:00
pci PCI: Clear bridge resource flags if requested size is 0 2011-05-16 18:33:35 -07:00
pcmcia Revert wrong fixes for common misspellings 2011-04-26 23:31:11 -07:00
platform eeepc-laptop: Use ACPI handle to identify rfkill port 2011-05-09 10:48:47 -04:00
pnp Fix common misspellings 2011-03-31 11:26:23 -03:00
power drivers: Final irq namespace conversion 2011-03-29 14:48:19 +02:00
pps Fix common misspellings 2011-03-31 11:26:23 -03:00
ps3 Fix common misspellings 2011-03-31 11:26:23 -03:00
rapidio rapidio: fix default routing initialization 2011-05-18 02:55:22 -07:00
regulator Fix common misspellings 2011-03-31 11:26:23 -03:00
rtc Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-05-17 08:02:04 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2011-05-18 06:49:02 -07:00
sbus Fix common misspellings 2011-03-31 11:26:23 -03:00
scsi Merge branch 'devicetree/merge' of git://git.secretlab.ca/git/linux-2.6 2011-05-18 13:25:57 -07:00
sfi Fix common misspellings 2011-03-31 11:26:23 -03:00
sh sh: Fix irq cleanup fallout 2011-03-30 00:15:49 +02:00
sn
spi Merge branch 'spi/merge' of git://git.secretlab.ca/git/linux-2.6 2011-04-11 15:44:38 -07:00
ssb Fix common misspellings 2011-03-31 11:26:23 -03:00
staging [media] tm6000: add detection based on eeprom name 2011-05-20 09:28:55 -03:00
target Fix common misspellings 2011-03-31 11:26:23 -03:00
tc
telephony Fix common misspellings 2011-03-31 11:26:23 -03:00
thermal
tty drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
uio Fix common misspellings 2011-03-31 11:26:23 -03:00
usb drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
uwb Fix common misspellings 2011-03-31 11:26:23 -03:00
vhost
video Merge branch 'fbmem' 2011-05-14 11:24:32 -07:00
virtio virtio_pci: Prevent double-free of pci regions after device hot-unplug 2011-04-21 22:57:00 +09:30
vlynq vlynq: Convert irq functions 2011-03-28 19:33:04 +02:00
w1 Fix common misspellings 2011-03-31 11:26:23 -03:00
watchdog drivercore: revert addition of of_match to struct device 2011-05-18 12:32:23 -06:00
xen PM: Add missing syscore_suspend() and syscore_resume() calls 2011-04-20 00:36:11 +02:00
zorro
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