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71e75c97f9
linux/drivers
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Christoph Hellwig 71e75c97f9 scsi: convert device_busy to atomic_t 
Avoid taking the queue_lock to check the per-device queue limit.  Instead
we do an atomic_inc_return early on to grab our slot in the queue,
and if necessary decrement it after finishing all checks.

Unlike the host and target busy counters this doesn't allow us to avoid the
queue_lock in the request_fn due to the way the interface works, but it'll
allow us to prepare for using the blk-mq code, which doesn't use the
queue_lock at all, and it at least avoids a queue_lock round trip in
scsi_device_unbusy, which is still important given how busy the queue_lock
is.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Webb Scales <webbnh@hp.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Robert Elliott <elliott@hp.com>
2014-07-25 07:43:45 -04:00
..
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acpi Merge branch 'acpi-video' 2014-07-10 21:04:25 +02:00
amba
ata scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
atm atm: fore200e.c: Cleaning up uninitialized variables 2014-06-02 17:11:03 -07:00
auxdisplay
base DMA, CMA: fix possible memory leak 2014-06-23 16:47:44 -07:00
bcma
block zram: revalidate disk after capacity change 2014-07-03 09:21:53 -07:00
bluetooth Bluetooth: Ignore H5 non-link packets in non-active state 2014-06-23 18:22:48 +02:00
bus bus/arm-cci: add dependency on OF && CPU_V7 2014-06-17 17:09:35 +02:00
cdrom Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2014-06-11 08:41:17 -07:00
char i8k: Fix non-SMP operation 2014-07-09 16:45:36 -07:00
clk This batch of fixes is for a handful of clock drivers from Allwinner, 2014-07-13 12:21:04 -07:00
clocksource clocksource: exynos_mct: Register the timer for stable udelay 2014-07-05 06:40:23 +09:00
connector Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00
cpufreq cpufreq: Makefile: fix compilation for davinci platform 2014-07-09 02:54:15 +02:00
cpuidle cpuidle: mvebu: Fix the name of the states 2014-06-18 21:54:46 +02:00
crypto crypto: caam - fix memleak in caam_jr module 2014-07-10 16:59:13 +08:00
dca
devfreq
dio
dma Update imx-sdma cyclic handling to report residue 2014-07-01 12:23:42 +05:30
edac PCI changes for the v3.16 merge window: 2014-06-02 12:15:19 -07:00
eisa
extcon
firewire IEEE 1394 (FireWire) subsystem fix: The 1394 drivers cannot and are not supposed 2014-07-14 17:17:53 -07:00
firmware efi-pstore: Fix an overflow on 32-bit builds 2014-06-27 07:30:32 +01:00
fmc
gpio gpio: mcp23s08: Eliminates redundant checking. 2014-07-05 01:14:06 +02:00
gpu Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2014-07-10 20:37:33 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2014-07-07 13:13:03 -07:00
hsi hsi: omap_ssi_port: use normal module refcounting 2014-06-05 00:59:05 +02:00
hv Drivers: hv: util: Fix a bug in the KVP code 2014-07-09 14:34:35 -07:00
hwmon hwmon: (adc128d818) Drop write support on inX_input attributes 2014-07-07 09:48:23 -07:00
hwspinlock
i2c i2c: sun6i-p2wi: Remove duplicate inclusion of module.h 2014-06-27 14:39:36 +02:00
ide
idle
iio iio: ti_am335x_adc: Fix: Use same step id at FIFOs both ends 2014-07-08 21:21:22 +01:00
infiniband Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2014-06-12 22:38:32 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-06-09 18:46:02 -07:00
iommu iommu/amd: Fix small race between invalidate_range_end/start 2014-06-20 16:14:22 +02:00
ipack
irqchip irqchip: spear_shirq: Fix interrupt offset 2014-06-21 23:26:39 +00:00
isdn net: ppp: don't call sk_chk_filter twice 2014-07-14 16:15:12 -07:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2014-06-12 13:08:09 -07:00
lguest
macintosh powerpc/macintosh/smu.c: Fix closing brace followed by if 2014-06-24 12:43:15 +10:00
mailbox
mcb
md . Fix DM multipath IO hang regression from 3.15 due to logic bug in 2014-07-11 09:33:36 -07:00
media Merge branch 'topic/omap3isp' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-06-12 23:04:28 -07:00
memory
memstick drivers/memstick/host/rtsx_pci_ms.c: add cancel_work when remove driver 2014-06-23 16:47:44 -07:00
message scsi: convert device_busy to atomic_t 2014-07-25 07:43:45 -04:00
mfd mfd: ab8500: Fix dt irq mapping 2014-06-26 13:34:15 +01:00
misc ARM: SoC fixes for 3.16 2014-06-25 12:19:01 -07:00
mmc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
mtd mtd: cfi_cmdset_0001.c: add support for Sharp LH28F640BF NOR 2014-07-13 22:22:47 -07:00
net hso: fix deadlock when receiving bursts of data 2014-07-14 19:27:34 -07:00
nfc
ntb
nubus kernel/printk: use symbolic defines for console loglevels 2014-06-04 16:54:17 -07:00
of Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-07-15 08:42:52 -07:00
oprofile
parisc
parport parport: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:15 -07:00
pci PCI: Fix unaligned access in AF transaction pending test 2014-06-17 15:40:13 -06:00
pcmcia
phy USB fixes for 3.16-rc5 2014-07-12 14:13:10 -07:00
pinctrl pinctrl: berlin: fix an error code in berlin_pinctrl_probe() 2014-07-05 01:15:35 +02:00
platform Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86 2014-06-10 16:58:32 -07:00
pnp Merge branches 'pnp', 'powercap', 'pm-runtime' and 'pm-opp' 2014-06-03 23:13:00 +02:00
power ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
powercap
pps
ps3
ptp ptp: ptp_pch depends on x86_32 2014-06-17 15:43:48 -07:00
pwm pwm: Changes for v3.16-rc1 2014-06-11 14:06:55 -07:00
rapidio rapidio/tsi721: use pci_enable_msix_exact() instead of pci_enable_msix() 2014-06-06 16:08:13 -07:00
regulator Merge remote-tracking branches 'regulator/fix/bcm590xx', 'regulator/fix/palmas' and 'regulator/fix/tps65218' into regulator-linus 2014-06-28 14:01:04 +01:00
remoteproc remoteproc: da8xx: don't select CMA on no-MMU 2014-06-17 17:09:36 +02:00
reset ARM: SoC driver changes 2014-06-02 16:35:49 -07:00
rpmsg
rtc drivers/rtc/rtc-puv3.c: remove "&dev->" for typo issue MIME-Version: 1.0 2014-06-20 08:22:39 +08:00
s390 scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
sbus
scsi scsi: convert device_busy to atomic_t 2014-07-25 07:43:45 -04:00
sfi
sh SH Driver Update for v3.16 2014-06-06 11:44:09 -07:00
sn
soc
spi Merge remote-tracking branches 'spi/fix/pxa2xx', 'spi/fix/qup' and 'spi/fix/sh-sci' into spi-linus 2014-06-28 14:01:23 +01:00
spmi
ssb
staging scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
target scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
tc TC: Handle device_register() errors. 2014-06-26 10:48:23 +01:00
thermal thermal: ti-soc-thermal: ti-bandgap.c: Cleaning up wrong address is checked 2014-07-01 09:52:35 +08:00
tty serial: imx: Fix build breakage 2014-07-11 17:43:13 -07:00
uio Revert "uio: fix vma io range check in mmap" 2014-06-17 16:07:08 -07:00
usb scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
uwb
vfio A handful of VFIO bug fixes for v3.16 2014-06-07 20:12:15 -07:00
vhost vhost-scsi: don't open-code kvfree 2014-06-23 09:22:48 +03:00
video fb: adv7393: add missing semicolon 2014-07-01 13:18:38 +03:00
virt
virtio
vlynq
vme
w1 w1: mxc_w1: Fix incorrect "presence" status 2014-06-19 17:51:46 -07:00
watchdog Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-06-21 06:47:01 -10:00
xen Fixes: 2014-07-17 08:02:35 -10:00
zorro
Kconfig
Makefile Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00