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linux/drivers
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H. Nikolaus Schaller ecfaf0c42f w1:omap_hdq: fix regression 
Commit e93762bbf6 ("w1: masters: omap_hdq: add support for 1-wire
mode") added a statement to clear the hdq_irqstatus flags in
hdq_read_byte().

If the hdq reading process is scheduled slowly or interrupts are
disabled for a while the hardware read activity might already be
finished on entry of hdq_read_byte().  And hdq_isr() already has set the
hdq_irqstatus to 0x6 (can be seen in debug mode) denoting that both, the
TXCOMPLETE and RXCOMPLETE interrupts occurred in parallel.

This means there is no need to wait and the hdq_read_byte() can just
read the byte from the hdq controller.

By resetting hdq_irqstatus to 0 the read process is forced to be always
waiting again (because the if statement always succeeds) but the
hardware will not issue another RXCOMPLETE interrupt.  This results in a
false timeout.

After such a situation the hdq bus hangs.

Link: http://lkml.kernel.org/r/b724765f87ad276a69625bc19806c8c8844c4590.1469513669.git.hns@goldelico.com
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-08-02 19:35:40 -04:00
..
accessibility
acpi treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
amba
android
ata New LED class driver: 2016-07-27 14:03:52 -07:00
atm drivers: atm: nicstar: Use the correct function to free some resources 2016-07-19 11:30:26 -07:00
auxdisplay
base firmware: support loading into a pre-allocated buffer 2016-08-02 19:35:10 -04:00
bcma wireless-drivers-next patches for 4.8 2016-07-25 11:09:19 -07:00
block dynamic_debug: only add header when used 2016-08-02 19:35:03 -04:00
bluetooth
bus ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
cdrom
char Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
clk treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
clocksource ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
connector
cpufreq ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
cpuidle powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2016-08-01 14:28:42 -04:00
dax
dca
devfreq
dio
dma dmaengine updates for 4.8-rc1 2016-07-28 15:45:17 -07:00
dma-buf
edac * Altera Arria10 ethernet FIFO buffer support (Thor Thayer) 2016-07-27 13:40:47 -07:00
eisa
extcon
firewire
firmware ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
fmc
fpga
gpio This is the bulk of GPIO changes for the v4.8 kernel cycle. 2016-07-26 19:16:01 -07:00
gpu Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
hid Merge branch 'for-4.8/hid-led' into for-linus 2016-07-28 10:49:23 +02:00
hsi
hv
hwmon hwmon updates for v4.8 (take 2) 2016-08-01 16:49:13 -04:00
hwspinlock
hwtracing Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-29 13:55:30 -07:00
i2c powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide 2016-07-29 13:29:06 -07:00
idle Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-30 12:56:26 -07:00
iio
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-07-24 00:53:32 -04:00
input ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
iommu IOMMU Updates for Linux v4.8 2016-08-01 07:25:10 -04:00
ipack
irqchip ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
isdn
leds powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
lguest
lightnvm block: get rid of bio_rw and READA 2016-07-20 17:37:01 -06:00
macintosh powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
mailbox mailbox: Fix format and type mismatches in Broadcom PDC driver 2016-07-28 21:27:31 +05:30
mcb
md Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2016-07-28 18:04:39 -07:00
media Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
memory ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
memstick memstick: don't allocate unused major for ms_block 2016-08-02 17:31:41 -04:00
message
mfd ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
misc powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
mmc MMC core: 2016-07-31 21:36:58 -04:00
mtd powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
net Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
nfc NFC 4.8 pull request 2016-07-20 23:39:36 -07:00
ntb
nubus
nvdimm libnvdimm for 4.8 2016-07-28 17:38:16 -07:00
nvme Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block 2016-07-26 15:37:51 -07:00
nvmem
of powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
oprofile
parisc
parport
pci treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
pcmcia
perf Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-29 13:55:30 -07:00
phy MMC core: 2016-07-31 21:36:58 -04:00
pinctrl This is the bulk of pin control changes for the v4.8 kernel cycle. 2016-07-28 17:06:51 -07:00
platform Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
pnp PNP material for v4.8-rc1 2016-07-26 18:27:20 -07:00
power ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
powercap
pps pps: do not crash when failed to register 2016-07-23 10:25:54 +09:00
ps3
ptp
pwm ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
rapidio rapidio/switches: add driver for IDT gen3 switches 2016-08-02 19:35:38 -04:00
ras
regulator ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
remoteproc
reset
rpmsg
rtc
s390 s390/zcrypt: fix possible memory leak in ap_module_init() 2016-07-31 06:10:41 -04:00
sbus
scsi powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
sfi
sh
sn
soc ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
spi ARM: DT updates for v4.8 2016-08-01 18:37:45 -04:00
spmi
ssb
staging Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
target Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-07-27 12:03:20 -07:00
tc
thermal
thunderbolt
tty ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
uio
usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2016-07-28 14:30:16 -07:00
uwb
vfio vfio: platform: check reset call return code during release 2016-07-19 10:54:45 -06:00
vhost
video fbdev/bfin_adv7393fb: move DRIVER_NAME before its first use 2016-08-02 19:35:05 -04:00
virt
virtio mm: fix build warnings in <linux/compaction.h> 2016-07-26 16:19:19 -07:00
vlynq
vme
w1 w1:omap_hdq: fix regression 2016-08-02 19:35:40 -04:00
watchdog watchdog: gpio_wdt: Fix missing platform_set_drvdata() in gpio_wdt_probe() 2016-07-27 10:47:43 +02:00
xen xen: features and fixes for 4.8-rc0 2016-07-27 11:35:37 -07:00
zorro
Kconfig
Makefile HSI changes for the v4.8 series 2016-07-27 15:18:53 -07:00