Ed Cashin e52a293264 aoe: avoid races between device destruction and discovery ... This change avoids a race that could result in a NULL pointer derference following a WARNing from kobject_add_internal, "don't try to register things with the same name in the same directory." The problem was found with a test that forgets and discovers an aoe device in a loop: while test ! -r /tmp/stop; do aoe-flush -a aoe-discover done The race was between aoedev_flush taking aoedevs out of the devlist, allowing a new discovery of the same AoE target to take place before the driver gets around to calling sysfs_remove_group. Fixing that one revealed another race between do_open and add_disk, and this patch avoids that, too. The fix required some care, because for flushing (forgetting) an aoedev, some of the steps must be performed under lock and some must be able to sleep. Also, for discovering a new aoedev, some steps might sleep. The check for a bad aoedev pointer remains from a time when about half of this patch was done, and it was possible for the bdev->bd_disk->private_data to become corrupted. The check should be removed eventually, but it is not expected to add significant overhead, occurring in the aoeblk_open routine. Signed-off-by: Ed Cashin <ecashin@coraid.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-12-17 17:15:25 -08:00
..
accessibility
acpi	Merge branch 'x86-acpi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-12-14 10:03:23 -08:00
amba	ARM: arm-soc: Cleanups on various subarchitectures	2012-12-12 11:51:39 -08:00
ata	1) More ACPI fixes	2012-12-15 12:37:18 -08:00
atm	solos-pci: fix double-free of TX skb in DMA mode	2012-12-12 00:16:47 -05:00
auxdisplay
base	Merge branch 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-12-14 09:59:59 -08:00
bcma	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2012-12-14 14:27:45 -08:00
block	aoe: avoid races between device destruction and discovery	2012-12-17 17:15:25 -08:00
bluetooth	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-12-12 18:07:07 -08:00
bus	ARM: OMAP: Fix drivers to depend on omap for internal devices	2012-12-16 15:23:37 -08:00
cdrom
char	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2012-12-17 08:26:17 -08:00
clk	ARM: arm-soc: Updates for Marvell mvebu/kirkwood	2012-12-14 14:54:26 -08:00
clocksource	ARM: arm-soc: Updates for Marvell mvebu/kirkwood	2012-12-14 14:54:26 -08:00
connector
cpufreq	ACPI and power management updates for 3.8-rc1	2012-12-11 12:45:35 -08:00
cpuidle	ARM: arm-soc: SoC updates for 3.8	2012-12-12 12:05:15 -08:00
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2012-12-15 12:35:19 -08:00
dca
devfreq	Merge branch 'pm-devfreq'	2012-12-07 23:13:36 +01:00
dio
dma	dmatest: check for dma mapping error	2012-12-17 17:15:13 -08:00
edac	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2012-12-14 14:27:45 -08:00
eisa
extcon
firewire	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
firmware	Merge branch 'core-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-12-14 10:08:40 -08:00
gpio	This is the MFD patch set for the 3.8 merge window.	2012-12-16 18:55:20 -08:00
gpu	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2012-12-17 08:26:17 -08:00
hid	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-12-13 19:22:22 -08:00
hsi
hv
hwmon	ARM: arm-soc: driver specific changes	2012-12-13 10:59:11 -08:00
hwspinlock
i2c	This is the MFD patch set for the 3.8 merge window.	2012-12-16 18:55:20 -08:00
ide
idle
iio	This is the MFD patch set for the 3.8 merge window.	2012-12-16 18:55:20 -08:00
infiniband	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2012-12-15 14:25:10 -08:00
input	This is the MFD patch set for the 3.8 merge window.	2012-12-16 18:55:20 -08:00
iommu	ARM: arm-soc: Header cleanups	2012-12-12 11:45:16 -08:00
ipack	TTY/Serial merge for 3.8-rc1	2012-12-11 14:08:47 -08:00
irqchip	ARM: arm-soc: Device-tree updates, take 2	2012-12-14 14:42:53 -08:00
isdn	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
leds	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds	2012-12-15 12:52:42 -08:00
lguest
macintosh	bootmem: fix wrong call parameter for free_bootmem()	2012-12-11 17:22:28 -08:00
md	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
media	fbdev changes for 3.8:	2012-12-15 13:03:48 -08:00
memory
memstick
message
mfd	This is the MFD patch set for the 3.8 merge window.	2012-12-16 18:55:20 -08:00
misc	Sound updates for 3.8-rc1	2012-12-13 11:51:23 -08:00
mmc	This is the MFD patch set for the 3.8 merge window.	2012-12-16 18:55:20 -08:00
mtd	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
net	drivers: remove reference to feature-removal-schedule.txt	2012-12-17 17:15:12 -08:00
nfc
nubus
of	drivers/of/fdt.c: re-use kernel's kbasename()	2012-12-17 17:15:18 -08:00
oprofile
parisc
parport
pci	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2012-12-13 14:20:19 -08:00
pcmcia	ARM: arm-soc: Header cleanups	2012-12-12 11:45:16 -08:00
pinctrl	ARM: arm-soc: multiplatform conversion patches	2012-12-13 10:57:16 -08:00
platform	Corentin has moved	2012-12-17 17:15:14 -08:00
pnp	Driver core updates for 3.8-rc1	2012-12-11 13:13:55 -08:00
power	This is the MFD patch set for the 3.8 merge window.	2012-12-16 18:55:20 -08:00
pps
ps3
ptp	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-12-12 18:07:07 -08:00
pwm
rapidio	Driver core updates for 3.8-rc1	2012-12-11 13:13:55 -08:00
regulator	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
remoteproc	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
rpmsg
rtc	rtc: DA9055 RTC driver	2012-12-17 17:15:21 -08:00
s390	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2012-12-13 14:20:19 -08:00
sbus
scsi	Merge branch 'for-3.8/core' of git://git.kernel.dk/linux-block	2012-12-17 08:27:23 -08:00
sfi
sh
sn
spi	SPI changes for v3.8	2012-12-13 19:15:11 -08:00
ssb	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2012-12-14 14:27:45 -08:00
staging	fbdev changes for 3.8:	2012-12-15 13:03:48 -08:00
target	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2012-12-15 14:25:10 -08:00
tc
thermal	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
tty	Merge tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2012-12-13 15:31:08 -08:00
uio	ARM: arm-soc: SoC updates for 3.8	2012-12-12 12:05:15 -08:00
usb	usb: musb: use io{read,write}*_rep accessors	2012-12-17 17:15:13 -08:00
uwb
vfio
vhost	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2012-12-15 14:25:10 -08:00
video	backlight: corgi_lcd: Use gpio_set_value_cansleep() to avoid WARN_ON	2012-12-17 17:15:17 -08:00
virt
virtio	virtio_balloon: introduce migration primitives to balloon pages	2012-12-11 17:22:27 -08:00
vlynq
vme
w1	ARM: OMAP: Fix drivers to depend on omap for internal devices	2012-12-16 15:23:37 -08:00
watchdog	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-12-13 12:00:02 -08:00
xen	Feature:	2012-12-16 17:39:14 -08:00
zorro
Kconfig
Makefile