Felipe Balbi d60ece5f01 i2c: omap: ensure writes to dev->buf_len are ordered ... if we allow compiler reorder our writes, we could fall into a situation where dev->buf_len is reset for no apparent reason. This bug was found with a simple script which would transfer data to an i2c client from 1 to 1024 bytes (a simple for loop), when we got to transfer sizes bigger than the fifo size, dev->buf_len was reset to zero before we had an oportunity to handle XDR Interrupt. Because dev->buf_len was zero, we entered omap_i2c_transmit_data() to transfer zero bytes, which would mean we would just silently exit omap_i2c_transmit_data() without actually writing anything to DATA register. That would cause XDR IRQ to trigger forever and we would never transfer the remaining bytes. After adding the memory barrier, we also drop resetting dev->buf_len to zero in omap_i2c_xfer_msg() because both omap_i2c_transmit_data() and omap_i2c_receive_data() will act until dev->buf_len reaches zero, rendering the other write in omap_i2c_xfer_msg() redundant. This patch has been tested with pandaboard for a few iterations of the script mentioned above. Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>		2012-11-14 17:44:37 +01:00
..
accessibility
acpi	ACPI video: Ignore errors after _DOD evaluation.	2012-11-03 09:52:54 +08:00
amba
ata	Merge branch 'samsung_platform_data' into staging/for_v3.7	2012-10-05 22:32:05 -03:00
atm	sections: fix section conflicts in drivers/atm	2012-10-06 03:04:40 +09:00
auxdisplay
base	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc	2012-11-10 21:58:34 +01:00
bcma	bcma: fix unregistration of cores	2012-10-15 14:45:51 -04:00
block	loop: Make explicit loop device destruction lazy	2012-10-30 08:37:31 +01:00
bluetooth	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-10-02 13:38:27 -07:00
bus	drivers: bus: omap_l3: fixup merge conflict resolution	2012-10-01 19:39:48 -07:00
cdrom
char	sonypi: suspend/resume callbacks should be conditionally compiled on CONFIG_PM_SLEEP	2012-10-25 12:05:50 -07:00
clk	spi: Updates for v3.7	2012-10-02 17:26:42 -07:00
clocksource	Power management updates for 3.7-rc1	2012-10-02 18:32:35 -07:00
connector	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-10-02 13:38:27 -07:00
cpufreq	cpufreq / powernow-k8: Change maintainer's email address	2012-10-31 21:02:57 +01:00
cpuidle	ACPI idle, CPU hotplug: Fix NULL pointer dereference during hotplug	2012-10-08 22:52:54 -04:00
crypto	ARM: soc: late platform updates	2012-10-07 20:55:16 +09:00
dca
devfreq
dio
dma	Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma	2012-10-26 14:59:01 -07:00
edac	amd64_edac:__amd64_set_scrub_rate(): avoid overindexing scrubrates[]	2012-10-24 16:13:27 +02:00
eisa
extcon	extcon : register for cable interest by cable name	2012-10-23 16:32:18 +09:00
firewire	firewire: cdev: fix user memory corruption (i386 userland on amd64 kernel)	2012-10-09 18:26:28 +02:00
firmware	firmware/memmap: avoid type conflicts with the generic memmap_init()	2012-10-19 14:07:47 -07:00
gpio	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc	2012-11-10 21:58:34 +01:00
gpu	drm/vmwgfx: Fix a case where the code would BUG when trying to pin GMR memory	2012-11-09 20:49:06 +10:00
hid	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid	2012-11-09 06:56:23 +01:00
hsi
hv	Drivers: hv: Cleanup error handling in vmbus_open()	2012-10-24 15:46:27 -07:00
hwmon	hwmon: Fix chip feature table headers	2012-11-05 21:54:40 +01:00
hwspinlock
i2c	i2c: omap: ensure writes to dev->buf_len are ordered	2012-11-14 17:44:37 +01:00
ide	sections: fix section conflicts in drivers/ide	2012-10-06 03:04:41 +09:00
idle
iio	iio: Remove duplicates for light/ in Kconfig and Makefile	2012-10-19 19:44:06 +01:00
infiniband	Merge branches 'cxgb4' and 'mlx4' into for-next	2012-10-23 09:03:49 -07:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2012-11-02 16:11:15 -07:00
iommu	iommu/tegra: smmu: Fix deadly typo	2012-10-24 16:58:53 +02:00
irqchip
isdn	isdn: Make CONFIG_ISDN depend on CONFIG_NETDEVICES	2012-11-07 18:59:26 -05:00
leds	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds	2012-10-10 20:14:07 +09:00
lguest	Merge branch 'virtio-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux	2012-10-07 21:04:56 +09:00
macintosh	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2012-10-06 03:16:12 +09:00
md	MD RAID10: Fix oops when creating RAID10 arrays via dm-raid.c	2012-10-31 11:42:30 +11:00
media	[media] Kconfig: Fix dependencies for driver autoselect options	2012-10-17 16:45:56 -03:00
memory
memstick
message
mfd	1. New drivers:	2012-10-07 17:29:24 +09:00
misc	pwm: Changes for v3.7-rc1	2012-10-10 20:15:24 +09:00
mmc	mmc: sdhci-s3c: fix the card detection in runtime-pm	2012-11-07 15:40:52 -05:00
mtd	mtd: Disable mtdchar mmap on MMU systems	2012-10-09 15:08:42 +01:00
net	gianfar: ethernet vanishes after restoring from hibernation	2012-11-09 17:08:36 -05:00
nfc
nubus
of	of/platform: sparse fix	2012-10-17 15:53:03 -05:00
oprofile	mm: use mm->exe_file instead of first VM_EXECUTABLE vma->vm_file	2012-10-09 16:22:18 +09:00
parisc
parport	Xtensa patchset for 3.7	2012-10-09 16:11:46 +09:00
pci	PCI/portdrv: Don't create hotplug slots unless port supports hotplug	2012-11-05 16:59:59 -07:00
pcmcia	Merge branch 'testing/driver-warnings' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc into fixes	2012-10-19 15:40:18 -07:00
pinctrl	pinctrl: samsung and exynos need to depend on OF && GPIOLIB	2012-11-06 10:02:14 +01:00
platform	Merge branches 'fixes-for-37', 'ec' and 'thermal' into release	2012-10-09 01:47:35 -04:00
pnp
power	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-10-13 11:27:59 +09:00
pps	idr: rename MAX_LEVEL to MAX_IDR_LEVEL	2012-10-06 03:04:56 +09:00
ps3
ptp
pwm	pwm: Changes for v3.7-rc1	2012-10-10 20:15:24 +09:00
rapidio	rapidio: update for destination ID allocation	2012-10-11 08:50:15 +09:00
regulator	MFD bits for the 3.7 merge window.	2012-10-05 12:01:30 +09:00
remoteproc	Merge branch 'virtio-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux	2012-10-07 21:04:56 +09:00
rpmsg	Merge branch 'virtio-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux	2012-10-07 21:04:56 +09:00
rtc	drivers/rtc/rtc-imxdi.c: add missing spin lock initialization	2012-10-25 14:37:53 -07:00
s390	s390/cio: fix length calculation in idset.c	2012-11-06 22:39:54 +01:00
sbus
scsi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc	2012-11-10 21:58:34 +01:00
sfi
sh	sh: Fix up more fallout from pointless ARM __iomem churn.	2012-10-15 14:08:48 +09:00
sn
spi	spi: Some minor MXS fixes	2012-10-28 11:13:54 -07:00
ssb
staging	Staging driver fixes for 3.7-rc3	2012-10-26 10:25:31 -07:00
target	target: Fix incorrect usage of nested IRQ spinlocks in ABORT_TASK path	2012-11-01 00:38:45 -07:00
tc
thermal	exynos4_tmu_driver_ids should be exynos_tmu_driver_ids.	2012-11-03 09:52:55 +08:00
tty	Revert "serial: omap: fix software flow control"	2012-10-24 11:57:21 -07:00
uio	mm: kill vma flag VM_RESERVED and mm->reserved_vm counter	2012-10-09 16:22:19 +09:00
usb	usb: gadget: g_ether: fix frame size check for 802.1Q	2012-11-07 21:12:26 -05:00
uwb
vfio	vfio: Fix PCI INTx disable consistency	2012-10-10 09:10:32 -06:00
vhost	vhost: fix mergeable bufs on BE hosts	2012-10-24 23:19:30 -04:00
video	Bug-fixes:	2012-11-02 13:26:11 -07:00
virt
virtio	virtio: Don't access index after unregister.	2012-11-09 14:54:24 +10:30
vlynq
vme
w1	char/misc driver merge for 3.7-rc1	2012-10-01 12:09:59 -07:00
watchdog	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu	2012-10-07 21:06:10 +09:00
xen	Bug-fixes:	2012-11-10 06:56:21 +01:00
zorro
Kconfig	ARM: soc: driver specific changes	2012-10-01 18:46:13 -07:00
Makefile	IPMI: Change link order	2012-10-16 18:07:12 -07:00