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aea9058801
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Jun'ichi Nomura aea9058801 dm: path selector use module refcount directly 
Fix refcount corruption in dm-path-selector

Refcounting with non-atomic ops under shared lock will corrupt the counter
in multi-processor system and may trigger BUG_ON().
Use module refcount.
# same approach as dm-target-use-module-refcount-directly.patch here
# https://www.redhat.com/archives/dm-devel/2008-December/msg00075.html

Typical oops:
  kernel BUG at linux-2.6.29-rc3/drivers/md/dm-path-selector.c:90!
  Pid: 11148, comm: dmsetup Not tainted 2.6.29-rc3-nm #1
  dm_put_path_selector+0x4d/0x61 [dm_multipath]
  Call Trace:
   [<ffffffffa031d3f9>] free_priority_group+0x33/0xb3 [dm_multipath]
   [<ffffffffa031d4aa>] free_multipath+0x31/0x67 [dm_multipath]
   [<ffffffffa031d50d>] multipath_dtr+0x2d/0x32 [dm_multipath]
   [<ffffffffa015d6c2>] dm_table_destroy+0x64/0xd8 [dm_mod]
   [<ffffffffa015b73a>] __unbind+0x46/0x4b [dm_mod]
   [<ffffffffa015b79f>] dm_swap_table+0x60/0x14d [dm_mod]
   [<ffffffffa015f963>] dev_suspend+0xfd/0x177 [dm_mod]
   [<ffffffffa0160250>] dm_ctl_ioctl+0x24c/0x29c [dm_mod]
   [<ffffffff80288cd3>] ? get_page_from_freelist+0x49c/0x61d
   [<ffffffffa015f866>] ? dev_suspend+0x0/0x177 [dm_mod]
   [<ffffffff802bf05c>] vfs_ioctl+0x2a/0x77
   [<ffffffff802bf4f1>] do_vfs_ioctl+0x448/0x4a0
   [<ffffffff802bf5a0>] sys_ioctl+0x57/0x7a
   [<ffffffff8020c05b>] system_call_fastpath+0x16/0x1b

Cc: stable@kernel.org
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2009-04-02 19:55:27 +01:00
..
accessibility
acpi Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-04-01 09:47:12 -07:00
amba amba: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
ata Merge branch 'origin' into devel 2009-03-28 20:29:51 +00:00
atm atm: fix non-const printk argument 2009-03-21 19:06:51 -07:00
auxdisplay auxdisplay: remove PARPORT dependency 2009-04-01 08:59:17 -07:00
base Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask 2009-03-30 18:00:26 -07:00
block loop: add ioctl to resize a loop device 2009-04-01 08:59:17 -07:00
bluetooth
cdrom
char Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6 2009-04-01 09:22:24 -07:00
clocksource Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2 2009-03-27 17:28:43 +01:00
connector
cpufreq Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq 2009-03-26 11:04:08 -07:00
cpuidle
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2009-03-26 11:04:34 -07:00
dca Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-23 09:25:58 -07:00
dio dio: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
dma Merge branch 'origin' into devel 2009-03-28 20:29:51 +00:00
edac edac: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
eisa Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2 2009-03-27 17:28:43 +01:00
firewire firewire: core: optimize propagation of BROADCAST_CHANNEL 2009-03-24 20:56:52 +01:00
firmware dmi: Let dmi_walk() users pass private data 2009-03-30 21:46:44 +02:00
gpio gpio: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:23 -07:00
gpu drm: detect hdmi monitor by hdmi identifier (v3) 2009-03-29 18:31:49 +10:00
hid Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6 2009-03-26 16:14:02 -07:00
hwmon lis3: SPI transport layer 2009-04-01 08:59:22 -07:00
i2c Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6 2009-03-30 17:54:32 -07:00
ide ide-floppy: do not complete rq's prematurely 2009-03-31 20:15:34 +02:00
idle
ieee1394 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2009-03-27 18:33:56 -07:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2009-03-28 13:30:43 -07:00
input proc 2/2: remove struct proc_dir_entry::owner 2009-03-31 01:14:44 +04:00
isdn proc tty: remove struct tty_operations::read_proc 2009-04-01 08:59:10 -07:00
leds
lguest lguest: use bool instead of int 2009-03-30 21:55:25 +10:30
macintosh
mca mca: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:23 -07:00
md dm: path selector use module refcount directly 2009-04-02 19:55:27 +01:00
media proc 2/2: remove struct proc_dir_entry::owner 2009-03-31 01:14:44 +04:00
memstick
message proc 2/2: remove struct proc_dir_entry::owner 2009-03-31 01:14:44 +04:00
mfd mfd: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:23 -07:00
misc drivers/misc/isl29003.c: driver for the ISL29003 ambient light sensor 2009-04-01 08:59:18 -07:00
mmc proc tty: switch sdio_uart to ->proc_fops 2009-04-01 08:59:09 -07:00
mtd Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2009-03-28 14:03:14 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-30 18:46:43 -07:00
nubus
of powerpc: add mmc-spi-slot bindings 2009-04-01 08:59:23 -07:00
oprofile oprofile: Thou shalt not call __exit functions from __init functions 2009-03-30 22:05:18 +10:30
parisc
parport
pci Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-04-01 09:47:12 -07:00
pcmcia Merge branch 'origin' into devel 2009-03-28 20:29:51 +00:00
platform Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6 2009-03-30 17:54:32 -07:00
pnp
power
ps3
rapidio rapidio: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
regulator
rtc rtc: test before subtraction on unsigned 2009-04-01 08:59:26 -07:00
s390 qeth: properly delete empty files. 2009-04-01 12:51:33 -07:00
sbus
scsi proc 2/2: remove struct proc_dir_entry::owner 2009-03-31 01:14:44 +04:00
serial serial: fixup /proc/tty/driver/serial after proc_fops conversion 2009-04-01 14:50:48 -07:00
sh maple: fix Error in kernel-doc notation 2009-03-29 08:12:39 -07:00
sn
spi spi_mpc83xx: add OF platform driver bindings 2009-04-01 08:59:22 -07:00
ssb b43: Add BCM4307 PCI-ID 2009-03-27 20:13:20 -04:00
staging Merge branch 'topic/snd_card_new-err' into for-linus 2009-03-24 00:35:35 +01:00
tc tc: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
telephony
thermal
uio UIO: Take offset into account when determining number of pages that can be mapped 2009-03-24 16:38:25 -07:00
usb proc tty: switch usb-serial to ->proc_fops 2009-04-01 08:59:10 -07:00
uwb
video efifb: dmi set video type 2009-04-01 08:59:34 -07:00
virtio virtio: more neatening of virtio_ring macros. 2009-03-30 21:55:23 +10:30
w1 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 into devel 2009-03-25 18:31:35 +00:00
watchdog Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6 2009-03-30 17:54:32 -07:00
xen PM: Rework handling of interrupts during suspend-resume 2009-03-30 21:46:54 +02:00
zorro zorro: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
Kconfig
Makefile ide/net: flip the order of SATA and network init 2009-03-28 13:06:16 -07:00