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027bd7e899
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Konrad Rzeszutek Wilk 027bd7e899 xen/xenbus: Avoid synchronous wait on XenBus stalling shutdown/restart. 
The 'read_reply' works with 'process_msg' to read of a reply in XenBus.
'process_msg' is running from within the 'xenbus' thread. Whenever
a message shows up in XenBus it is put on a xs_state.reply_list list
and 'read_reply' picks it up.

The problem is if the backend domain or the xenstored process is killed.
In which case 'xenbus' is still awaiting - and 'read_reply' if called -
stuck forever waiting for the reply_list to have some contents.

This is normally not a problem - as the backend domain can come back
or the xenstored process can be restarted. However if the domain
is in process of being powered off/restarted/halted - there is no
point of waiting on it coming back - as we are effectively being
terminated and should not impede the progress.

This patch solves this problem by checking whether the guest is the
right domain. If it is an initial domain and hurtling towards death -
there is no point of continuing the wait. All other type of guests
continue with their behavior (as Xenstore is expected to still be
running in another domain).

Fixes-Bug: http://bugs.xenproject.org/xen/bug/8
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
2014-04-15 17:41:28 +01:00
..
accessibility
acpi ACPI / sleep: Add extra checks for HW Reduced ACPI mode sleep states 2014-03-13 22:11:39 +01:00
amba
ata Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-03-31 15:27:37 -07:00
atm
auxdisplay
base PM / hibernate: Fix restore hang in freeze_processes() 2014-02-26 01:13:15 +01:00
bcma Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-01-30 17:20:32 -08:00
block Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2014-03-31 15:08:51 -07:00
bluetooth
bus drivers: bus: fix CCI driver kcalloc call parameters swap 2014-01-31 15:15:13 -08:00
cdrom Merge branch 'for-3.14/drivers' of git://git.kernel.dk/linux-block 2014-01-30 11:40:10 -08:00
char Char/Misc fixes for 3.14-rc3 2014-02-14 16:13:00 -08:00
clk Single fix for a clock driver merged in 3.14-rc1. Without this fix the 2014-03-08 10:51:30 -08:00
clocksource Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-01 11:00:07 -07:00
connector
cpufreq Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-01 10:16:10 -07:00
cpuidle Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-01 11:00:07 -07:00
crypto crypto/nx/nx-842: Fix handling of vmalloc addresses 2014-02-11 11:24:49 +11:00
dca
devfreq Merge branches 'pm-cpufreq' and 'pm-devfreq' 2014-01-29 11:48:23 +01:00
dio
dma Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma 2014-03-01 21:30:43 -06:00
edac i7300_edac: Fix device reference count 2014-02-25 09:43:13 +01:00
eisa
extcon ASoC: dapm: Add locking to snd_soc_dapm_xxxx_pin functions 2014-02-20 18:40:07 +09:00
firewire Merge branch 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2014-03-08 11:51:13 -08:00
firmware Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-03-31 14:13:25 -07:00
fmc drivers/fmc/fmc-write-eeprom.c: fix decimal permissions 2014-02-25 15:25:43 -08:00
gpio gpio: tb10x: GPIO_TB10X needs to select GENERIC_IRQ_CHIP 2014-02-05 11:13:59 +01:00
gpu Merge branch 'x86-cpufeature-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-01 10:11:21 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2014-03-17 08:00:50 -07:00
hsi
hv x86: hyperv: Fixup the (brain) damage caused by the irq cleanup 2014-03-05 13:42:14 +01:00
hwmon hwmon: (max1668) Fix writing the minimum temperature 2014-02-18 15:53:49 -08:00
hwspinlock
i2c i2c: cpm: Fix build by adding of_address.h and of_irq.h 2014-03-24 14:54:21 +01:00
ide drivers: ide: Include appropriate header file in ide-pio-blacklist.c 2014-01-28 23:35:09 -08:00
idle ACPI and power management updates for 3.14-rc1 2014-01-24 15:51:02 -08:00
iio iio:gyro: bug on L3GD20H gyroscope support 2014-02-18 10:24:49 +00:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2014-03-09 13:50:14 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-03-30 17:20:40 -07:00
iommu drivers/iommu/omap-iommu-debug.c: fix decimal permissions 2014-02-25 15:25:42 -08:00
ipack
irqchip irqchip: sun7i/sun6i: Disable NMI before registering the handler 2014-03-31 11:12:57 +02:00
isdn isdn/capi: Make Middleware depend on CAPI2.0 2014-03-18 15:02:57 -04:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2014-01-28 18:53:01 -08:00
lguest
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2014-01-27 21:11:26 -08:00
mailbox drivers/mailbox/omap: make mbox->irq signed for error handling 2014-01-23 16:36:53 -08:00
md dm cache: fix access beyond end of origin device 2014-03-12 13:52:00 -04:00
media [media] adv7842: Composite free-run platfrom-data fix 2014-02-04 06:46:10 -02:00
memory
memstick drivers/memstick/host/rtsx_pci_ms.c: fix ms card data transfer bug 2014-01-23 16:37:04 -08:00
message drivers/message/i2o/i2o_config.c: fix deadlock in compat_ioctl(I2OGETIOPS) 2014-02-10 16:01:40 -08:00
mfd sound fixes for 3.14-rc4 2014-02-21 09:55:32 -08:00
misc mm: fix GFP_THISNODE callers and clarify 2014-03-10 17:26:19 -07:00
mmc workqueue: remove deprecated WQ_NON_REENTRANT 2014-03-29 09:33:03 -04:00
mtd Just a single fix for the UBI module unload path which makes sure we do not 2014-02-27 10:36:50 -08:00
net Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2014-03-31 15:08:51 -07:00
nfc
ntb
nubus
of Device tree compatible match order bug fix 2014-02-21 14:35:05 -08:00
oprofile
parisc
parport
pci Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-01 11:22:57 -07:00
pcmcia PCI changes for the v3.14 merge window: 2014-01-22 16:39:28 -08:00
phy phy: let phy_provider_register be the last step in registering PHY 2014-02-18 12:13:16 -08:00
pinctrl ARM: SoC fixes for 3.14-rc 2014-03-09 19:27:31 -07:00
platform platform/chrome: Cleanups and improvements 2014-01-29 20:06:01 -08:00
pnp Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-03-31 14:13:25 -07:00
power Few fixes: 2014-02-14 10:32:28 -08:00
powercap
pps
ps3 ps3-vuart: don't use PREPARE_WORK 2014-03-07 10:24:48 -05:00
ptp
pwm pwm: lp3943: Fix potential memory leak during request 2014-02-26 15:45:12 +01:00
rapidio rapidio/tsi721: fix tasklet termination in dma channel release 2014-03-04 07:55:49 -08:00
regulator regulator: Fixes for v3.14-rc5 2014-03-04 08:41:42 -08:00
remoteproc
reset
rpmsg
rtc drivers/rtc/rtc-s3c.c: fix incorrect way of save/restore of S3C2410_TICNT for TYPE_S3C64XX 2014-03-04 07:55:48 -08:00
s390 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-01 11:22:57 -07:00
sbus Sparc: sparc_cpu_model isn't in asm/system.h any more [ver #2] 2014-02-20 13:34:11 -05:00
scsi Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-03-31 15:27:37 -07:00
sfi
sh
sn
spi Merge remote-tracking branches 'spi/fix/ath79', 'spi/fix/atmel', 'spi/fix/coldfire', 'spi/fix/fsl-dspi', 'spi/fix/imx' and 'spi/fix/topcliff-pch' into spi-linus 2014-03-07 11:08:13 +08:00
ssb Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-01-30 17:20:32 -08:00
staging Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2014-03-31 15:08:51 -07:00
target Target/sbc: Fix sbc_copy_prot for offset scatters 2014-03-06 20:52:11 -08:00
tc
thermal Thermal: thermal zone governor fix 2014-03-03 23:15:57 +08:00
tty Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-03-31 10:59:39 -07:00
uio
usb Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2014-03-31 15:08:51 -07:00
uwb
vfio mm: close PageTail race 2014-03-04 07:55:47 -08:00
vhost vhost: validate vhost_get_vq_desc return value 2014-03-28 16:10:35 -04:00
video video: Kconfig: Allow more broad selection of the imxfb framebuffer driver. 2014-02-14 10:44:52 +02:00
virt
virtio A few simple fixes. Quiet cycle. 2014-01-22 22:24:35 -08:00
vlynq drivers/vlynq/vlynq.c: fix another resource size off by 1 error 2014-01-23 16:36:55 -08:00
vme VME: Correct read/write alignment algorithm 2014-02-07 08:16:14 -08:00
w1 drivers/w1/masters/w1-gpio.c: add strong pullup emulation 2014-01-23 16:37:04 -08:00
watchdog watchdog: w83697hf_wdt: return ENODEV if no device was found 2014-02-21 20:36:46 +01:00
xen xen/xenbus: Avoid synchronous wait on XenBus stalling shutdown/restart. 2014-04-15 17:41:28 +01:00
zorro
Kconfig
Makefile