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Olaf Hering 3cace4a616 Drivers: hv: utils: run polling callback always in interrupt context 
All channel interrupts are bound to specific VCPUs in the guest
at the point channel is created. While currently, we invoke the
polling function on the correct CPU (the CPU to which the channel
is bound to) in some cases we may run the polling function in
a non-interrupt context. This  potentially can cause an issue as the
polling function can be interrupted by the channel callback function.
Fix the issue by running the polling function on the appropriate CPU
at interrupt level. Additional details of the issue being addressed by
this patch are given below:

Currently hv_fcopy_onchannelcallback is called from interrupts and also
via the ->write function of hv_utils. Since the used global variables to
maintain state are not thread safe the state can get out of sync.
This affects the variable state as well as the channel inbound buffer.

As suggested by KY adjust hv_poll_channel to always run the given
callback on the cpu which the channel is bound to. This avoids the need
for locking because all the util services are single threaded and only
one transaction is active at any given point in time.

Additionally, remove the context variable, they will always be the same as
recv_channel.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2015-12-14 19:12:21 -08:00
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accessibility
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acpi Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2015-12-04 11:30:45 -08:00
amba
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android
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ata ata/sata_fsl.c: add ATA_FLAG_NO_LOG_PAGE to blacklist the controller for log page reads 2015-12-07 10:25:57 -05:00
atm
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auxdisplay
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base drivers/base/memory.c: prohibit offlining of memory blocks with missing sections 2015-12-12 10:15:34 -08:00
bcma
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block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2015-12-12 10:24:00 -08:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-11-10 18:11:41 -08:00
bus Merge branch 'x15-audio-fixes' into omap-for-v4.4/fixes 2015-11-12 09:58:21 -08:00
cdrom
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char ipmi: move timer init to before irq is setup 2015-12-09 13:13:06 -06:00
clk ARM: SoC fixes for 4.4-rc 2015-12-12 16:43:44 -08:00
clocksource clocksource: Mmio: remove artificial 32bit limitation 2015-12-10 19:37:18 +01:00
connector
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cpufreq ARM: SoC fixes for 4.4-rc 2015-12-12 16:43:44 -08:00
cpuidle
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crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-12-05 10:46:44 -08:00
dca
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devfreq
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dio
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dma dmaengine: at_hdmac: use %pad format string for dma_addr_t 2015-11-16 09:21:05 +05:30
dma-buf
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edac
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eisa
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extcon
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firewire IEEE 1394 subsystem patch: 2015-11-11 10:21:34 -08:00
firmware ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
fmc
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fpga fpga manager: Fix firmware resource leak on error 2015-11-24 15:25:46 -08:00
gpio gpio: omap: drop omap1 mpuio specific irq_mask/unmask callbacks 2015-11-30 13:50:21 +01:00
gpu vgaarb: fix signal handling in vga_get() 2015-12-11 14:04:44 +10:00
hid USB fixes for 4.4-rc5 2015-12-13 11:58:18 -08:00
hsi
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hv Drivers: hv: utils: run polling callback always in interrupt context 2015-12-14 19:12:21 -08:00
hwmon hwmon: (scpi) skip unsupported sensors properly 2015-11-16 09:59:50 -08:00
hwspinlock
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hwtracing Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-11-13 20:04:17 -08:00
i2c i2c: i801: add Intel Lewisburg device IDs 2015-11-20 16:22:21 +01:00
ide
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idle
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iio iio: adc: spmi-vadc: add missing of_node_put 2015-11-21 18:24:44 +00:00
infiniband IB/mlx5: Postpone remove_keys under knowledge of coming preemption 2015-12-08 16:55:31 -05:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-11-13 21:41:14 -08:00
iommu
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ipack
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irqchip irqchip/versatile-fpga: Fix PCI IRQ mapping on Versatile PB 2015-12-01 22:50:16 +01:00
isdn isdn: Partially revert debug format string usage clean up 2015-11-25 11:49:58 -05:00
leds
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lguest
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lightnvm lightnvm: do not compile in debugging by default 2015-12-07 09:14:20 -07:00
macintosh
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mailbox
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mcb
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md dm btree: fix bufio buffer leaks in dm_btree_del() error path 2015-12-10 10:30:18 -05:00
media various: fix pci_set_dma_mask return value checking 2015-11-20 16:17:32 -08:00
memory ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
memstick
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message SCSI queue for 4.4. 2015-11-12 07:06:18 -05:00
mfd
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misc cxl: Set endianess of kernel contexts 2015-12-08 16:57:01 +11:00
mmc
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mtd mtd: nand: fix shutdown/reboot for multi-chip systems 2015-11-16 10:51:39 -08:00
net Series of 4.4-rc fixes 2015-12-10 14:42:22 -08:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-11-10 18:11:41 -08:00
ntb
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nubus
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nvdimm libnvdimm, pmem: fix size trim in pmem_direct_access() 2015-11-12 09:55:23 -08:00
nvme lightnvm: replace req queue with nvmdev for lld 2015-12-07 09:14:19 -07:00
nvmem
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of of/irq: Export of_irq_find_parent again 2015-12-09 09:08:36 -06:00
oprofile
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parisc parisc iommu: fix panic due to trying to allocate too large region 2015-12-12 16:07:25 +01:00
parport
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pci PCI updates for v4.4: 2015-12-09 09:26:06 -08:00
pcmcia
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perf
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phy
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pinctrl pinctrl: sh-pfc: sh7734: Add missing cfg macro parameter to fix build 2015-12-01 11:13:04 +01:00
platform platform/chrome: Branch for v4.4 2015-11-13 21:53:18 -08:00
pnp
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power
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powercap
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pps
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ps3
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ptp
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pwm pwm: Changes for v4.4-rc1 2015-11-11 09:16:10 -08:00
rapidio
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ras
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regulator
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remoteproc remoteproc: fix memory leak of remoteproc ida cache layers 2015-11-26 17:44:28 +02:00
reset
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rpmsg
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rtc rtc: ds1307: fix alarm reading at probe time 2015-11-26 18:11:26 +01:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2015-11-18 08:59:29 -08:00
sbus
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scsi SCSI fixes on 20151205 2015-12-06 08:02:25 -08:00
sfi
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sh drivers: sh: Get rid of CONFIG_ARCH_SHMOBILE_MULTI 2015-11-17 02:12:46 +09:00
sn
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soc Few Keystone fixes for 4.4-rcx 2015-11-25 23:48:12 +01:00
spi Merge remote-tracking branches 'spi/fix/bcm63xx', 'spi/fix/doc', 'spi/fix/mediatek' and 'spi/fix/pl022' into spi-linus 2015-11-30 12:26:47 +00:00
spmi
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ssb
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staging Staging driver fixes for 4.4-rc5 2015-12-13 12:24:39 -08:00
target target/stat: print full t10_wwn.model buffer 2015-11-28 21:23:13 -08:00
tc
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thermal imx: thermal: use CPU temperature grade info for thresholds 2015-11-23 16:38:40 -08:00
thunderbolt
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tty serial: export fsl8250_handle_irq 2015-11-20 16:19:54 -08:00
uio
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usb USB: add quirk for devices with broken LPM 2015-12-11 15:40:51 -08:00
uwb
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vfio Revert: "vfio: Include No-IOMMU mode" 2015-12-04 08:38:42 -07:00
vhost vhost: replace % with & on data path 2015-12-07 17:28:10 +02:00
video
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virt
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virtio virtio_ring: shadow available ring flags & index 2015-12-07 17:28:11 +02:00
vlynq
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vme
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w1
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watchdog watchdog: mtk_wdt: Use MODE_KEY when stopping the watchdog 2015-11-23 09:00:09 +01:00
xen xen: bug fixes for 4.4-rc2 2015-11-26 11:42:25 -08:00
zorro
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Kconfig
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Makefile null_blk: register as a LightNVM device 2015-11-16 15:22:28 -07:00