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Sylvain Chouleur 21b3ddd39f efi: Don't use spinlocks for efi vars 
All efivars operations are protected by a spinlock which prevents
interruptions and preemption. This is too restricted, we just need a
lock preventing concurrency.
The idea is to use a semaphore of count 1 and to have two ways of
locking, depending on the context:
- In interrupt context, we call down_trylock(), if it fails we return
  an error
- In normal context, we call down_interruptible()

We don't use a mutex here because the mutex_trylock() function must not
be called from interrupt context, whereas the down_trylock() can.

Signed-off-by: Sylvain Chouleur <sylvain.chouleur@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Sylvain Chouleur <sylvain.chouleur@gmail.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
 		2016-09-09 16:08:42 +01:00
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accessibility
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acpi ACPI / drivers: replace acpi_probe_lock spinlock with mutex 2016-09-02 22:22:21 +02:00
amba
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android Revert "android: binder: fix dangling pointer comparison" 2016-08-18 17:21:37 +02:00
ata pata_ninja32: Avoid corrupting status flags 2016-08-30 11:59:47 -04:00
atm drivers: atm: nicstar: Use the correct function to free some resources 2016-07-19 11:30:26 -07:00
auxdisplay
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base PM / runtime: Add _rcuidle suffix to allow rpm_idle() use from idle 2016-08-31 03:00:59 +02:00
bcma wireless-drivers-next patches for 4.8 2016-07-25 11:09:19 -07:00
block Revert "floppy: refactor open() flags handling" 2016-08-25 08:56:51 -06:00
bluetooth Bluetooth: btmrvl: reset is_suspending flag in failure path 2016-07-18 10:13:02 +02:00
bus ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
cdrom
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char tpm: invalid self test error message 2016-09-03 08:27:37 +10:00
clk Some fixes for rk3399 register errors that revealed themself 2016-08-29 17:08:35 -07:00
clocksource clocksource/drivers/atmel-pit: Fix compilation error 2016-08-29 09:51:39 +02:00
connector
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cpufreq cpufreq: dt: Add terminate entry for of_device_id tables 2016-08-31 02:49:05 +02:00
cpuidle powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
crypto crypto: vmx - fix null dereference in p8_aes_xts_crypt 2016-08-24 20:51:20 +08:00
dax dax: fix device-dax region base 2016-08-26 17:39:35 -07:00
dca
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devfreq
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dio
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dma dmaengine: img-mdc: fix a possible NULL dereference 2016-08-22 11:57:49 +05:30
dma-buf dma-buf: Release module reference on creation failure 2016-07-18 14:10:49 +02:00
edac EDAC, skx_edac: Add EDAC driver for Skylake 2016-08-21 10:58:34 -07:00
eisa
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extcon
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firewire
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firmware efi: Don't use spinlocks for efi vars 2016-09-09 16:08:42 +01:00
fmc
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fpga drivers/fpga/Kconfig: fix build failure 2016-08-04 08:50:07 -04:00
gpio gpio: make any OF dependent driver depend on OF_GPIO 2016-08-19 15:01:29 +02:00
gpu This pull request brings in fixes for VC4 3D in 4.8, most of which are 2016-09-02 15:55:15 +10:00
hid Merge branch 'for-4.8/hid-led' into for-linus 2016-07-28 10:49:23 +02:00
hsi
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hv
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hwmon hwmon: (it87) Add missing sysfs attribute group terminator 2016-08-29 05:31:31 -07:00
hwspinlock
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hwtracing Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-29 13:55:30 -07:00
i2c i2c: meson: Use complete() instead of complete_all() 2016-08-15 00:55:34 +02:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide 2016-07-29 13:29:06 -07:00
idle Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-30 12:56:26 -07:00
iio Char/Misc driver fixes for 4.8-rc5 2016-09-03 11:38:43 -07:00
infiniband Merge branch 'misc-fixes' into k.o/for-4.8-rc 2016-08-25 11:17:10 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2016-08-26 18:36:23 -07:00
iommu Merge branch 'for-joerg/arm-smmu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into iommu/fixes 2016-08-22 12:33:56 +02:00
ipack
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irqchip irqchip/mips-gic: Implement activate op for device domain 2016-08-22 18:37:51 +02:00
isdn
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leds powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
lguest
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lightnvm block: get rid of bio_rw and READA 2016-07-20 17:37:01 -06:00
macintosh drivers/macintosh: Delete owner assignment 2016-08-22 11:09:33 +10:00
mailbox mailbox: Fix format and type mismatches in Broadcom PDC driver 2016-07-28 21:27:31 +05:30
mcb
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md - a stable fix in both DM crypt and DM log-writes for too large bios (as 2016-09-03 17:29:58 -07:00
media media updates for v4.8-rc1 2016-08-04 09:59:37 -04:00
memory MTD updates for v4.8: 2016-08-02 17:05:11 -04:00
memstick memstick: don't allocate unused major for ms_block 2016-08-02 17:31:41 -04:00
message
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mfd ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
misc Char/Misc driver fixes for 4.8-rc5 2016-09-03 11:38:43 -07:00
mmc mmc: fix use-after-free of struct request 2016-08-25 14:11:43 -06:00
mtd This pull request contains mostly cleanups and minor 2016-08-04 19:51:49 -04:00
net Add Killer E2500 device ID in alx driver. 2016-08-29 00:23:50 -04:00
nfc NFC 4.8 pull request 2016-07-20 23:39:36 -07:00
ntb NTB: ntb_hw_intel: use local variable pdev 2016-08-05 10:34:13 -04:00
nubus
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nvdimm nvdimm, btt: add a size attribute for BTTs 2016-08-08 09:26:14 -07:00
nvme Merge branch 'nvmf-4.8-rc' of git://git.infradead.org/nvme-fabrics into for-linus 2016-08-29 08:39:22 -06:00
nvmem
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of of: fix reference counting in of_graph_get_endpoint_by_regs 2016-08-15 11:15:05 -05:00
oprofile
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parisc dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
parport
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pci Char/Misc driver fixes for 4.8-rc5 2016-09-03 11:38:43 -07:00
pcmcia
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perf drivers/perf: arm_pmu: Fix NULL pointer dereference during probe 2016-09-02 17:17:52 +01:00
phy phy: sun9i-usb: fix error handling 2016-08-12 14:59:10 +05:30
pinctrl pinctrl: intel: merrifield: Add missed header 2016-08-10 15:46:28 +02:00
platform intel_pmic_gpio: Make explicitly non-modular 2016-08-28 22:31:52 -07:00
pnp PNP: pnpbios: add header file to fix build errors 2016-07-27 18:52:54 +02:00
power power_supply: tps65217-charger: fix missing platform_set_drvdata() 2016-08-15 23:10:44 +02:00
powercap
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pps pps: do not crash when failed to register 2016-07-23 10:25:54 +09:00
ps3
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ptp
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pwm pwm: Changes for v4.8-rc1 2016-08-06 00:01:33 -04:00
rapidio rapidio/tsi721: fix incorrect detection of address translation condition 2016-09-01 17:52:02 -07:00
ras
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regulator pwm: Changes for v4.8-rc1 2016-08-06 00:01:33 -04:00
remoteproc dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
reset
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rpmsg
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rtc RTC for 4.8 2016-08-05 09:48:22 -04:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2016-08-16 15:50:22 -07:00
sbus
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scsi drivers/scsi/wd719x.c: remove last declaration using DEFINE_PCI_DEVICE_TABLE 2016-09-01 17:52:01 -07:00
sfi
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sh
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sn
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soc ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
spi ARM: DT updates for v4.8 2016-08-01 18:37:45 -04:00
spmi
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ssb
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staging First round of IIO fixes for the 4.8 cycle. 2016-08-23 17:39:31 -04:00
target target: iblock_execute_sync_cache() should use bio_set_op_attrs() 2016-08-07 14:41:02 -06:00
tc
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thermal thermal: imx: fix a possible NULL dereference 2016-08-19 21:34:08 +08:00
thunderbolt thunderbolt: Don't declare Falcon Ridge unsupported 2016-08-31 13:25:02 +02:00
tty serial: 8250: added acces i/o products quad and octal serial cards 2016-08-31 16:28:26 +02:00
uio
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usb usb: musb: Fix locking errors for host only mode 2016-08-30 14:11:38 +02:00
uwb
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vfio vfio/pci: Fix NULL pointer oops in error interrupt setup handling 2016-08-08 16:16:23 -06:00
vhost vhost/scsi: fix reuse of &vq->iov[out] in response 2016-08-23 17:16:57 +03:00
video dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
virt
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virtio virtio: fix error handling for debug builds 2016-08-09 13:42:35 +03:00
vlynq
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vme
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w1 w1:omap_hdq: fix regression 2016-08-02 19:35:40 -04:00
watchdog watchdog: gpio_wdt: Fix missing platform_set_drvdata() in gpio_wdt_probe() 2016-07-27 10:47:43 +02:00
xen xenbus: don't look up transaction IDs for ordinary writes 2016-08-24 18:16:18 +01:00
zorro
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Kconfig
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Makefile virtio/vhost: new features for 4.8 2016-08-06 09:20:13 -04:00