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Ian Abbott ef4b4b274c staging: comedi: comedi_fops: extend spin-lock scope in comedi_event() 
`comedi_event()` is called from low-level drivers to handle comedi
asynchronous command event flags.  As a safety check, it checks the
subdevice's "run" flags to make sure an asynchronous command is running.
It can also change the run flags to mark the command as no longer
running (possibly also marking it as terminated with an error).
Checking the runflags and modifying them involves two uses of the
subdevice's spin-lock.  It seems better to do it with a single use of
the spin-lock.  This also avoids possible interactions with
`do_become_nonbusy()`.

Acquire the subdevice's spin-lock at the start of `comedi_event()` and
release it near the end, before a possible call to `kill_fasync()` (but
after it's parameter values have been determined).

Add and make use of few new inline helper functions:

* `__comedi_clear_subdevice_runflags()` -- clears some run flags without
  using the spin-lock
* `__comedi_set_subdevice_runflags()` -- sets some run flags without
  using the spin-lock
* `__comedi_get_subdevice_runflags()` -- a spin-lockless version of
  `comedi_get_subdevice_runflags()
* `__comedi_is_subdevice_running()` -- a spin-lockless version of
* `comedi_is_subdevice_running()`

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2015-04-03 13:11:54 +02:00
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accessibility
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acpi Revert "x86/PCI: Refine the way to release PCI IRQ resources" 2015-03-20 14:56:19 +01:00
amba
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android android: binder: fix binder mmap failures 2015-03-01 18:43:51 -08:00
ata sata-fsl: Apply link speed limits 2015-03-02 12:08:43 -05:00
atm
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auxdisplay
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base regmap: Fixes for v4.0 2015-03-17 10:41:26 -07:00
bcma
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block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2015-02-28 10:21:57 -08:00
bluetooth Bluetooth: btusb: Fix issue with CSR based Intel Wireless controllers 2015-02-23 09:30:35 +02:00
bus ARM: SoC platform changes 2015-02-17 09:27:54 -08:00
cdrom
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char Not entirely surprising: the ongoing QEMU work on virtio 1.0 has revealed 2015-03-17 10:36:01 -07:00
clk The clk fixes for 4.0-rc4 comprise three themes. First are the usual 2015-03-15 15:07:08 -07:00
clocksource clockevents: sun5i: Fix setup_irq init sequence 2015-03-05 15:01:37 +01:00
connector
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coresight
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cpufreq Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal 2015-03-06 13:43:33 -08:00
cpuidle cpuidle: mvebu: Update cpuidle thresholds for Armada XP SOCs 2015-03-13 18:31:29 +01:00
crypto Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
dca
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devfreq Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools' 2015-02-13 21:39:06 +01:00
dio
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dma Merge 4.0-rc5 into staging-testing 2015-03-23 21:36:48 +01:00
dma-buf
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edac * A fix to sb_edac for proper detection on SNB machines 2015-02-19 11:18:14 -08:00
eisa
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extcon
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firewire
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firmware * Fix regression in DMI sysfs code for handling "End of Table" entry 2015-03-02 14:18:57 +01:00
fmc
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gpio gpio: tps65912: fix wrong container_of arguments 2015-02-23 15:40:32 +01:00
gpu Merge tag 'drm-intel-fixes-2015-03-19' of git://anongit.freedesktop.org/drm-intel into drm-fixes 2015-03-20 17:32:21 +10:00
hid HID: wacom: check for wacom->shared before following the pointer 2015-03-17 20:59:55 +01:00
hsi
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hv Char / Misc patches for 3.20-rc1 2015-02-15 10:48:44 -08:00
hwmon hwmon: (ads7828) Check return value of devm_regmap_init_i2c 2015-02-22 20:10:30 -08:00
hwspinlock
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i2c Revert "i2c: core: Dispose OF IRQ mapping at client removal time" 2015-03-12 10:23:05 +01:00
ide ide_tape: convert jiffies with jiffies_to_msecs 2015-03-18 23:25:57 -04:00
idle intel_idle: Add ->enter_freeze callbacks 2015-02-15 19:40:09 +01:00
iio iio: light: ltr501: Powerdown device on error 2015-04-02 10:27:39 +02:00
infiniband IB/mlx4: Saturate RoCE port PMA counters in case of overflow 2015-03-18 15:17:11 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-03-19 16:43:10 -07:00
iommu iommu/io-pgtable-arm: Add built time dependency 2015-03-03 14:04:12 +01:00
ipack
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irqchip Merge branch 'irqchip/urgent-gic' into irqchip/urgent 2015-03-15 01:41:26 +00:00
isdn isdn: icn: use strlcpy() when parsing setup options 2015-03-15 22:24:37 -04:00
leds
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lguest OK, this has the big virtio 1.0 implementation, as specified by OASIS. 2015-02-18 09:24:01 -08:00
macintosh
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mailbox
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mcb
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md One fix for md in 4.0-rc4 2015-03-22 16:38:19 -07:00
media mm: gup: use get_user_pages_unlocked 2015-02-11 17:06:05 -08:00
memory
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memstick
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message
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mfd Changes to existing drivers: 2015-02-18 09:05:48 -08:00
misc mei: make device disabled on stop unconditionally 2015-03-01 19:34:50 -08:00
mmc mmc: pwrseq_simple: fix error path in mmc_pwrseq_simple_alloc 2015-03-19 11:26:35 +01:00
mtd This pull request fixes a bug introduced during the v4.0 merge window where we 2015-03-21 10:36:44 -07:00
net Revert "net: cx82310_eth: use common match macro" 2015-03-18 22:37:38 -04:00
nfc
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ntb
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nubus
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of Revert "of: Fix premature bootconsole disable with 'stdout-path'" 2015-03-19 08:46:54 -05:00
oprofile
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parisc
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parport
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pci PCI updates for v4.0: 2015-03-12 09:45:46 -07:00
pcmcia Revert "pcmcia: add a new resource manager for non ISA systems" 2015-03-11 14:21:23 +01:00
phy phy: omap-usb2: Fix missing clk_prepare call when using old dt name 2015-03-13 17:14:39 +05:30
pinctrl pinctrl: sun4i: GPIOs configured as irq must be set to input before reading 2015-03-18 10:56:46 +01:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 11:12:07 -08:00
pnp Merge branches 'pnp', 'pm-cpuidle' and 'pm-cpufreq' 2015-02-21 04:29:16 +01:00
power
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powercap powercap / RAPL: handle domains with different energy units 2015-03-13 23:18:44 +01:00
pps
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ps3
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ptp
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pwm pwm: tegra: Use NSEC_PER_SEC 2015-02-18 08:40:29 +01:00
rapidio Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
ras
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regulator Merge remote-tracking branches 'regulator/fix/gpio-enable' and 'regulator/fix/tps65910' into regulator-linus 2015-03-16 11:43:24 +00:00
remoteproc
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reset
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rpmsg virtio_rpmsg: set DRIVER_OK before using device 2015-03-13 15:55:42 +10:30
rtc rtc: at91rm9200: double locking bug in at91_rtc_interrupt() 2015-03-18 01:58:16 +01:00
s390 s390/dcss: array index 'i' is used before limits check. 2015-02-26 09:24:48 +01:00
sbus
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scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
sfi
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sh drivers: sh: Disable PM runtime for multi-platform r8a7740 with genpd 2015-02-24 07:26:12 +09:00
sn
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soc ARM: SoC driver updates 2015-02-17 09:38:59 -08:00
spi Merge remote-tracking branches 'spi/fix/atmel', 'spi/fix/doc', 'spi/fix/dw', 'spi/fix/img-spfi', 'spi/fix/pl022' and 'spi/fix/ti-qspi' into spi-linus 2015-03-06 21:10:56 +00:00
spmi
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ssb treewide: Remove unnecessary SSB_DEVTABLE_END macro 2015-02-11 14:38:29 -08:00
staging staging: comedi: comedi_fops: extend spin-lock scope in comedi_event() 2015-04-03 13:11:54 +02:00
target target: do not reject FUA CDBs when write cache is enabled but emulate_write_cache is 0 2015-03-19 23:26:46 -07:00
tc
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thermal thermal: Make sysfs attributes of cooling devices default attributes 2015-03-05 01:47:57 -04:00
thunderbolt
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tty serial: 8250_dw: Fix deadlock in LCR workaround 2015-03-11 16:39:52 +01:00
uio
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usb USB / PHY driver fixes for 4.0-rc5 2015-03-22 11:33:55 -07:00
uwb USB patches for 3.20-rc1 2015-02-15 10:24:55 -08:00
vfio vfio-pci: Add missing break to enable VFIO_PCI_ERR_IRQ_INDEX 2015-03-12 09:51:38 -06:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
video OMAPDSS: fix regression with display sysfs files 2015-02-26 10:23:15 +02:00
virt
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virtio virtio_mmio: fix access width for mmio 2015-03-17 12:12:21 +10:30
vlynq
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vme vme: tsi148: Master windows support USERx and CR/CSR accesses, not slaves 2015-03-06 17:03:22 -08:00
w1
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watchdog watchdog: at91sam9: request the irq with IRQF_NO_SUSPEND 2015-03-06 00:46:31 +01:00
xen Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
zorro
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Kconfig
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Makefile
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