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eca37c7c11
linux/drivers
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Ricardo Ribalda Delgado eca37c7c11 spi/spi-xilinx: Fix race condition on last word read 
Some users have reported that in polled mode the driver fails randomly
to read the last word of the transfer.

The end condition used for the transmissions (in polled and irq mode)
has been the TX_EMPTY flag. But Lars-Peter Clausen has identified a delay
from the TX_EMPTY to the actual end of the data rx.

I believe that this race condition has not been detected until now
because of the latency added by the IRQ handler or the PCIe bridge.
This bugs affects setups with low latency access to the spi core.

This patch replaces the readout logic:

For all the words, except the last one, the TX_EMPTY flag is used (and
cached).

If !TX_EMPY or is the last word. The status register is read and the
RX_EMPTY flag is used.

The performance is not affected: there is an extra read of the
Status Register, but the readout can start as soon as there is a word
in the buffer.

Reported-by: Edward Kigwana <ekigwana@scires.com>
Initial-fix-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
2015-10-29 09:03:42 +09:00
..
accessibility
acpi Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2015-09-11 16:13:47 -07:00
amba
android mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
ata Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2015-09-03 16:55:55 -07:00
atm
auxdisplay
base Additional power management and ACPI material for v4.3-rc1 2015-09-11 19:11:06 -07:00
bcma
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2015-09-11 12:33:03 -07:00
bluetooth Bluetooth: hci_bcm: Fix crash on suspend 2015-08-28 21:09:14 +02:00
bus regmap: Changes for v4.3 2015-09-08 16:48:55 -07:00
cdrom
char IPMI updates for 4.3 2015-09-08 18:19:17 -07:00
clk ARM: SoC: late fixes and dependencies 2015-09-10 17:59:04 -07:00
clocksource - New Device Support 2015-09-04 11:35:03 -07:00
connector
cpufreq Additional power management and ACPI material for v4.3-rc1 2015-09-11 19:11:06 -07:00
cpuidle Additional power management and ACPI material for v4.3-rc1 2015-09-11 19:11:06 -07:00
crypto drivers/crypto/qat: use seq_hex_dump() to dump buffers 2015-09-10 13:29:01 -07:00
dca
devfreq
dio
dma dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
dma-buf
edac edac updates for v4.3-rc1 2015-09-11 16:21:12 -07:00
eisa
extcon regulator: Updates for v4.3 2015-08-31 15:49:19 -07:00
firewire
firmware kexec: split kexec_load syscall from kexec core code 2015-09-10 13:29:01 -07:00
fmc
gpio Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-09-04 15:49:32 -07:00
gpu media updates for v4.3-rc1 2015-09-11 16:42:39 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-09-04 12:02:11 -07:00
hsi mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
hv
hwmon Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2015-09-11 16:13:47 -07:00
hwspinlock
hwtracing/coresight
i2c Merge branch 'i2c/for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2015-09-08 16:16:26 -07:00
ide
idle
iio This is the bulk of GPIO changes for the v4.3 kernel cycle: 2015-09-04 10:07:45 -07:00
infiniband Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-09-11 19:00:42 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-09-11 19:17:28 -07:00
iommu fs/seq_file: convert int seq_vprint/seq_printf/etc... returns to void 2015-09-11 15:21:34 -07:00
ipack
irqchip Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-08 11:36:56 -07:00
isdn libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
leds - Stop using LP855X Platform Data to control regulators 2015-09-04 11:40:40 -07:00
lguest
macintosh powerpc updates for 4.3 2015-09-03 16:41:38 -07:00
mailbox Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2015-09-05 18:11:04 -07:00
mcb
md SCSI misc on 20150911 2015-09-11 18:15:18 -07:00
media media updates for v4.3-rc1 2015-09-11 16:42:39 -07:00
memory IOMMU Updates for Linux v4.3 2015-09-08 17:22:35 -07:00
memstick
message
mfd Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-09-04 15:49:32 -07:00
misc Merge git://www.linux-watchdog.org/linux-watchdog 2015-09-11 15:12:59 -07:00
mmc MMC core: 2015-09-08 16:33:16 -07:00
mtd MTD updates #2 for 4.3-rc1: 2015-09-09 11:17:33 -07:00
net NTB bug and documentation fixes, new device IDs, performance 2015-09-11 19:29:00 -07:00
nfc This is the bulk of GPIO changes for the v4.3 kernel cycle: 2015-09-04 10:07:45 -07:00
ntb NTB: Fix range check on memory window index 2015-09-07 15:27:12 -04:00
nubus
nvdimm libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
nvmem
of Merge branch 'i2c/for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2015-09-08 16:16:26 -07:00
oprofile
parisc parisc: use seq_hex_dump() to dump buffers 2015-09-10 13:29:01 -07:00
parport
pci kexec: split kexec_load syscall from kexec core code 2015-09-10 13:29:01 -07:00
pcmcia pcmcia: soc_common: remove skt_dev_info's clk pointer 2015-09-03 16:01:03 +01:00
perf
phy This is the bulk of GPIO changes for the v4.3 kernel cycle: 2015-09-04 10:07:45 -07:00
pinctrl This is the bulk of pin control changes for the v4.3 development 2015-09-04 10:22:09 -07:00
platform Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2015-09-11 16:13:47 -07:00
pnp
power Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2015-09-11 16:13:47 -07:00
powercap powercap / RAPL: disable the 2nd power limit properly 2015-08-29 01:46:40 +02:00
pps
ps3
ptp
pwm pwm: Changes for v4.3-rc1 2015-09-09 10:55:32 -07:00
rapidio
ras
regulator regmap: Changes for v4.3 2015-09-08 16:48:55 -07:00
remoteproc
reset reset: ath79: Fix missing spin_lock_init 2015-09-01 14:48:40 +02:00
rpmsg
rtc rtc: abx80x: fix RTC write bit 2015-09-05 19:37:31 +02:00
s390 drivers/s390/crypto/zcrypt_api.c: use seq_hex_dump() to dump buffers 2015-09-10 13:29:01 -07:00
sbus
scsi Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-09-11 19:00:42 -07:00
sfi
sh
sn
soc ARM: SoC: late fixes and dependencies 2015-09-10 17:59:04 -07:00
spi spi/spi-xilinx: Fix race condition on last word read 2015-10-29 09:03:42 +09:00
spmi Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-01 14:33:35 -07:00
ssb
staging Additional power management and ACPI material for v4.3-rc1 2015-09-11 19:11:06 -07:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-09-11 19:00:42 -07:00
tc
thermal thermal: fix intel PCH thermal driver mismerge 2015-09-11 20:06:59 -07:00
thunderbolt
tty xen: MFN/GFN/BFN terminology changes for 4.3-rc0 2015-09-10 16:21:11 -07:00
uio
usb Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-09-01 18:46:42 -07:00
uwb
vfio
vhost
video Merge branch 'akpm' (patches from Andrew) 2015-09-10 18:19:42 -07:00
virt
virtio virtio_balloon: do not change memory amount visible via /proc/meminfo 2015-09-08 13:32:11 +03:00
vlynq
vme
w1 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-09-01 18:46:42 -07:00
watchdog Merge git://www.linux-watchdog.org/linux-watchdog 2015-09-11 15:12:59 -07:00
xen Merge branch 'akpm' (patches from Andrew) 2015-09-10 18:19:42 -07:00
zorro
Kconfig Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-09-03 16:27:01 -07:00
Makefile This is the bulk of pin control changes for the v4.3 development 2015-09-04 10:22:09 -07:00