Mike Marciniszyn 6a82649f21 IB/qib: Avoid returning EBUSY from MR deregister ... A timing issue can occur where qib_mr_dereg can return -EBUSY if the MR use count is not zero. This can occur if the MR is de-registered while RDMA read response packets are being progressed from the SDMA ring. The suspicion is that the peer sent an RDMA read request, which has already been copied across to the peer. The peer sees the completion of his request and then communicates to the responder that the MR is not needed any longer. The responder tries to de-register the MR, catching some responses remaining in the SDMA ring holding the MR use count. The code now uses a get/put paradigm to track MR use counts and coordinates with the MR de-registration process using a completion when the count has reached zero. A timeout on the delay is in place to catch other EBUSY issues. The reference count protocol is as follows: - The return to the user counts as 1 - A reference from the lk_table or the qib_ibdev counts as 1. - Transient I/O operations increase/decrease as necessary A lot of code duplication has been folded into the new routines init_qib_mregion() and deinit_qib_mregion(). Additionally, explicit initialization of fields to zero is now handled by kzalloc(). Also, duplicated code 'while.*num_sge' that decrements reference counts have been consolidated in qib_put_ss(). Reviewed-by: Ramkrishna Vepa <ramkrishna.vepa@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Roland Dreier <roland@purestorage.com>		2012-07-08 18:05:19 -07:00
..
accessibility	…
acpi	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-06-30 11:11:58 -07:00
amba	arm-soc: driver specific updates	2012-05-26 12:22:27 -07:00
ata	Viresh has moved	2012-06-20 14:39:36 -07:00
atm	solos-pci: Fix DMA support	2012-05-24 16:22:53 -04:00
auxdisplay	…
base	PM / Sleep: Prevent waiting forever on asynchronous suspend after abort	2012-06-24 23:31:09 +02:00
bcma	bcma: fix null pointer in bcma_core_pci_irq_ctl	2012-06-08 13:47:07 -04:00
block	mtip32xx: Changes to sysfs entries	2012-05-31 08:46:50 +02:00
bluetooth	Bluetooth: btmrvl: Do not send vendor events to bluetooth stack	2012-06-19 00:19:11 -03:00
cdrom	…
char	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2012-06-18 12:20:36 -07:00
clk	clk: mxs: fix clock lookup after freeing init memory	2012-06-25 16:51:48 -07:00
clocksource	clocksource: sh_tmu: Use clockevents_config_and_register().	2012-06-11 17:10:16 +09:00
connector	…
cpufreq	…
cpuidle	…
crypto	arm-soc: clock driver changes	2012-05-26 12:42:29 -07:00
dca	…
devfreq	Power management updates for 3.5	2012-05-23 14:07:06 -07:00
dio	…
dma	Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma	2012-06-20 22:12:52 -07:00
edac	edac: Do alignment logic properly in edac_align_ptr()	2012-06-11 12:43:16 -03:00
eisa	…
extcon	extcon: max8997: Add missing kfree for info->edev in max8997_muic_remove()	2012-06-18 16:30:42 -07:00
firewire	IEEE 1394 (FireWire) subsystem updates post v3.4:	2012-05-24 12:57:47 -07:00
firmware	…
gpio	gpio/samsung: fix the typo 'exynos5_xxx' instead of 'exonys5_xxx'	2012-06-03 21:21:01 -07:00
gpu	Merge branch 'drm-intel-fixes' of git://people.freedesktop.org/~danvet/drm-intel into drm-fixes	2012-06-27 19:56:20 +01:00
hid	Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid	2012-06-26 11:23:41 -07:00
hsi	…
hv	Driver core pull for 3.5-rc1	2012-05-22 16:02:13 -07:00
hwmon	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-06-29 10:29:54 -07:00
hwspinlock	…
i2c	i2c: Add generic I2C multiplexer using pinctrl API	2012-06-04 16:49:43 +02:00
ide	drivers/ide/ide-cs.c: adjust suspicious bit operation	2012-06-12 15:51:41 -07:00
idle	…
ieee802154	…
iio	iio: drop wrong reference from Kconfig	2012-06-14 17:28:46 -07:00
infiniband	IB/qib: Avoid returning EBUSY from MR deregister	2012-07-08 18:05:19 -07:00
input	i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING	2012-05-30 10:55:34 +02:00
iommu	iommu/amd: Fix deadlock in ppr-handling error path	2012-06-04 12:47:44 +02:00
isdn	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-05-24 11:54:29 -07:00
leds	leds: Make LEDS_ASIC3 and LEDS_RENESAS_TPU depend on LEDS_CLASS=y	2012-06-12 10:56:25 +08:00
lguest	…
macintosh	…
md	md: 2 fixes for 3.5-rc	2012-06-06 09:49:28 -07:00
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-06-25 14:53:09 -07:00
memory	…
memstick	…
message	Merge branch 'akpm' (Andrew's patch-bomb)	2012-05-31 18:10:18 -07:00
mfd	Viresh has moved	2012-06-20 14:39:36 -07:00
misc	misc: mei: set WDIOF_ALARMONLY on mei watchdog	2012-06-13 15:34:31 -07:00
mmc	Revert "mmc: omap_hsmmc: Enable Auto CMD12"	2012-06-26 16:10:30 -04:00
mtd	Fix the debugfs regression - we never enable it because incorrect	2012-06-28 11:41:43 -07:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-06-28 11:20:31 -07:00
nfc	NFC: potential integer overflow problem in check_crc()	2012-05-25 11:16:16 -04:00
nubus	…
of	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2012-05-29 18:27:19 -07:00
oprofile	oprofile: perf: use NR_CPUS instead or nr_cpumask_bits for static array	2012-06-21 16:15:11 +02:00
parisc	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-05-22 19:22:50 -07:00
parport	Driver core pull for 3.5-rc1	2012-05-22 16:02:13 -07:00
pci	USB: add NO_D3_DURING_SLEEP flag and revert 151b612847	2012-06-13 13:11:39 -07:00
pcmcia	…
pinctrl	Merge branch 'akpm' (Andrew's patch-bomb)	2012-06-20 14:41:57 -07:00
platform	drivers/platform/x86/acerhdf.c: correct Boris' mail address	2012-06-07 14:43:55 -07:00
pnp	…
power	A bunch of fixes for v3.5, nothing extraordinary.	2012-05-31 12:10:15 -07:00
pps	…
ps3	…
ptp	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-05-22 19:22:50 -07:00
rapidio	rapidio/tsi721: add DMA engine support	2012-05-31 17:49:31 -07:00
regulator	regulator: palmas: fix regmap offsets for enable/disable	2012-06-23 11:37:28 +01:00
remoteproc	remoteproc/omap: fix dev_err typo	2012-06-17 10:31:03 +03:00
rpmsg	…
rtc	Merge branches 'bugfix-battery', 'bugfix-misc', 'bugfix-rafael', 'bugfix-turbostat', 'bugfix-video' and 'workaround-pss' into release	2012-06-04 00:48:41 -04:00
s390	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2012-05-31 10:51:10 -07:00
sbus	…
scsi	SCSI & usb-storage: add try_rc_10_first flag	2012-06-22 22:05:31 -07:00
sfi	…
sh	sh: intc: Kill off special reservation interface.	2012-05-22 19:07:55 +09:00
sn	…
spi	SPI: fix over-eager devm_xxx() conversion	2012-06-18 11:27:04 +01:00
ssb	…
staging	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-06-25 14:53:09 -07:00
target	target: Return error to initiator if SET TARGET PORT GROUPS emulation fails	2012-06-12 20:12:25 -07:00
tc	…
thermal	…
tty	Serial driver fixes for 3.5-rc4	2012-06-20 15:13:13 -07:00
uio	…
usb	USB: CP210x Add 10 Device IDs	2012-06-26 16:14:34 -07:00
uwb	…
vhost	vhost: use USER_DS in vhost_worker thread	2012-06-26 21:10:56 -07:00
video	fbdev fixes for 3.5	2012-06-16 16:59:05 -07:00
virt	…
virtio	virtio-mmio: Devices parameter parsing	2012-05-22 12:16:15 +09:30
vlynq	…
vme	…
w1	arm-soc: clock driver changes	2012-05-26 12:42:29 -07:00
watchdog	watchdog: core: fix WDIOC_GETSTATUS return value	2012-06-28 20:40:56 +02:00
xen	Five bug-fixes:	2012-06-15 17:17:15 -07:00
zorro	…
Kconfig	Staging tree pull request for 3.5-rc1	2012-05-22 16:34:21 -07:00
Makefile	arm-soc: driver specific updates	2012-05-26 12:22:27 -07:00