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Sjur Brændeland aded024a12 virtio_console: Don't access uninitialized data. 
Don't access uninitialized work-queue when removing device.
The work queue is initialized only if the device multi-queue.
So don't call cancel_work unless this is a multi-queue device.

This fixes the following panic:

Kernel panic - not syncing: BUG!
Call Trace:
62031b28:  [<6026085d>] panic+0x16b/0x2d3
62031b30:  [<6004ef5e>] flush_work+0x0/0x1d7
62031b60:  [<602606f2>] panic+0x0/0x2d3
62031b68:  [<600333b0>] memcpy+0x0/0x140
62031b80:  [<6002d58a>] unblock_signals+0x0/0x84
62031ba0:  [<602609c5>] printk+0x0/0xa0
62031bd8:  [<60264e51>] __mutex_unlock_slowpath+0x13d/0x148
62031c10:  [<6004ef5e>] flush_work+0x0/0x1d7
62031c18:  [<60050234>] try_to_grab_pending+0x0/0x17e
62031c38:  [<6004e984>] get_work_gcwq+0x71/0x8f
62031c48:  [<60050539>] __cancel_work_timer+0x5b/0x115
62031c78:  [<628acc85>] unplug_port+0x0/0x191 [virtio_console]
62031c98:  [<6005061c>] cancel_work_sync+0x12/0x14
62031ca8:  [<628ace96>] virtcons_remove+0x80/0x15c [virtio_console]
62031ce8:  [<628191de>] virtio_dev_remove+0x1e/0x7e [virtio]
62031d08:  [<601cf242>] __device_release_driver+0x75/0xe4
62031d28:  [<601cf2dd>] device_release_driver+0x2c/0x40
62031d48:  [<601ce0dd>] driver_unbind+0x7d/0xc6
62031d88:  [<601cd5d9>] drv_attr_store+0x27/0x29
62031d98:  [<60115f61>] sysfs_write_file+0x100/0x14d
62031df8:  [<600b737d>] vfs_write+0xcb/0x184
62031e08:  [<600b58b8>] filp_close+0x88/0x94
62031e38:  [<600b7686>] sys_write+0x59/0x88
62031e88:  [<6001ced1>] handle_syscall+0x5d/0x80
62031ea8:  [<60030a74>] userspace+0x405/0x531
62031f08:  [<600d32cc>] sys_dup+0x0/0x5e
62031f28:  [<601b11d6>] strcpy+0x0/0x18
62031f38:  [<600be46c>] do_execve+0x10/0x12
62031f48:  [<600184c7>] run_init_process+0x43/0x45
62031fd8:  [<60019a91>] new_thread_handler+0xba/0xbc

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Cc: stable@kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 		2013-02-07 11:37:37 +10:30
..
agp Drivers: char: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
hw_random Drivers: char: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
ipmi Drivers: char: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
mwave 8250: three way resolve of the 8250 diffs 2012-07-17 09:11:50 -07:00
pcmcia TTY: call tty_port_destroy in the rest of drivers 2012-11-15 17:20:58 -08:00
tpm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2012-12-16 15:40:50 -08:00
xilinx_hwicap char: remove use of __devexit 2012-11-21 12:55:19 -08:00
Kconfig char/misc: remove CONFIG_EXPERIMENTAL dependencies 2012-09-18 16:14:53 +01:00
Makefile IPMI: Change link order 2012-10-16 18:07:12 -07:00
apm-emulation.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/apm 2012-04-05 17:34:30 -07:00
applicom.c drivers/char/applicom.c: fix information leak to userland 2010-10-27 18:03:14 -07:00
applicom.h
…
bfin-otp.c
…
bsr.c powerpc/BSR: cleanup the error path of bsr_init 2012-07-17 10:27:38 -07:00
ds1302.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ds1620.c ARM: footbridge: nw_gpio_lock is raw_spin_lock 2012-10-07 10:33:12 +02:00
dsp56k.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
dtlk.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
efirtc.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
generic_nvram.c drivers: fix up various ->llseek() implementations 2011-07-20 20:47:58 -04:00
genrtc.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
hangcheck-timer.c
…
hpet.c drivers/char: for hpet, add count checking, and ~0UL instead of -1 2012-11-26 16:16:35 -08:00
i8k.c module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
lp.c Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:12:23 -07:00
mbcs.c char: remove use of __devinitconst 2012-11-21 12:55:19 -08:00
mbcs.h Fix common misspellings 2011-03-31 11:26:23 -03:00
mem.c /dev/mem: use phys_addr_t for physical addresses 2012-10-24 15:32:50 -07:00
misc.c switch device_get_devnode() and ->devnode() to umode_t * 2012-01-03 22:54:55 -05:00
mmtimer.c drivers/char/mmtimer.c: Remove useless kfree 2012-09-26 13:20:40 -07:00
msm_smd_pkt.c drivers/char/msm_smd_pkt.c: don't use IS_ERR() 2011-08-25 16:25:33 -07:00
mspec.c mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 2012-10-09 16:22:19 +09:00
nsc_gpio.c
…
nvram.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
nwbutton.c drivers/char: removes unnecessary semicolon 2012-09-26 13:20:39 -07:00
nwbutton.h
…
nwflash.c Merge branch 'late/fixes' into fixes 2012-10-07 07:22:32 -07:00
pc8736x_gpio.c pc8736x_gpio: use platform_device_unregister in pc8736x_gpio_cleanup() 2012-10-24 15:52:29 -07:00
ppdev.c Merge branch 'master' into for-next 2012-10-28 19:29:19 +01:00
ps3flash.c char: remove use of __devinit 2012-11-21 12:55:19 -08:00
random.c random: prime last_data value per fips requirements 2012-11-08 07:19:18 -05:00
raw.c blockdev: remove bd_block_size_semaphore again 2012-11-29 10:52:19 -08:00
rtc.c drivers/char: removes unnecessary semicolon 2012-09-26 13:20:39 -07:00
scx200_gpio.c
…
snsc.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
snsc.h headers: kobject.h redux 2011-01-10 08:51:44 -08:00
snsc_event.c
…
sonypi.c char: remove use of __devexit 2012-11-21 12:55:19 -08:00
tb0219.c char: remove use of __devexit 2012-11-21 12:55:19 -08:00
tile-srom.c tile-srom.c driver: minor code cleanup 2012-04-02 12:14:10 -04:00
tlclk.c drivers/char/tlclk.c: fix error return code 2012-08-16 10:09:15 -07:00
toshiba.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
ttyprintk.c TTY: call tty_port_destroy in the rest of drivers 2012-11-15 17:20:58 -08:00
uv_mmtimer.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
virtio_console.c virtio_console: Don't access uninitialized data. 2013-02-07 11:37:37 +10:30