Wang Xin 9a9e295e7c eeprom: at24: fix unexpected timeout under high load ... Within at24_loop_until_timeout the timestamp used for timeout checking is recorded after the I2C transfer and sleep_range(). Under high CPU load either the execution time for I2C transfer or sleep_range() could actually be larger than the timeout value. Worst case the I2C transfer is only tried once because the loop will exit due to the timeout although the EEPROM is now ready. To fix this issue the timestamp is recorded at the beginning of each iteration. That is, before I2C transfer and sleep. Then the timeout is actually checked against the timestamp of the previous iteration. This makes sure that even if the timeout is reached, there is still one more chance to try the I2C transfer in case the EEPROM is ready. Example: If you have a system which combines high CPU load with repeated EEPROM writes you will run into the following scenario. - System makes a successful regmap_bulk_write() to EEPROM. - System wants to perform another write to EEPROM but EEPROM is still busy with the last write. - Because of high CPU load the usleep_range() will sleep more than 25 ms (at24_write_timeout). - Within the over-long sleeping the EEPROM finished the previous write operation and is ready again. - at24_loop_until_timeout() will detect timeout and won't try to write. Signed-off-by: Wang Xin <xin.wang7@cn.bosch.com> Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>		2018-10-02 16:58:21 +02:00
..
accessibility
acpi	Merge branch 'acpi-bus'	2018-09-07 10:05:20 +02:00
amba
android	android: binder: fix the race mmap and alloc_new_buf_locked	2018-09-12 09:18:29 +02:00
ata	for-linus-20180920	2018-09-21 09:41:05 +02:00
atm
auxdisplay	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
base	firmware: Fix security issue with request_firmware_into_buf()	2018-09-12 09:31:00 +02:00
bcma
block	for-linus-20180929	2018-09-29 14:52:14 -07:00
bluetooth	Bluetooth: hci_ldisc: Free rw_semaphore on close	2018-09-11 13:33:57 +02:00
bus	Merge branch 'perm-fix' into omap-for-v4.19/fixes-v2	2018-08-28 09:58:03 -07:00
cdrom	cdrom: Fix info leak/OOB read in cdrom_ioctl_drive_status	2018-08-29 08:09:20 -06:00
char	A few fixes that came around or after the merge window, except	2018-09-12 19:33:56 -10:00
clk	clk: x86: Stop marking clocks as CLK_IS_CRITICAL	2018-09-17 18:47:58 -07:00
clocksource	clocksource/drivers/timer-atmel-pit: Properly handle error cases	2018-09-27 12:01:45 +02:00
connector
cpufreq	cpufreq: qcom-kryo: Fix section annotations	2018-09-29 15:01:10 +02:00
cpuidle	cpuidle: menu: Retain tick when shallow state is selected	2018-08-25 13:16:08 +02:00
crypto	crypto: ccp - add timeout support in the SEV command	2018-09-13 13:27:43 +08:00
dax	device-dax: Add missing address_space_operations	2018-09-22 09:07:33 -07:00
dca
devfreq	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
dio
dma	dmaengine: mic_x100_dma: use devm_kzalloc to fix an issue	2018-08-27 11:16:04 +05:30
dma-buf
edac	EDAC: Add missing MEM_LRDDR4 entry in edac_mem_types[]	2018-08-17 15:13:34 +02:00
eisa
extcon
firewire	firewire: use 64-bit time_t based interfaces	2018-08-17 16:20:27 -07:00
firmware	efi/libstub/arm: default EFI_ARMSTUB_DTB_LOADER to y	2018-09-12 16:41:41 +02:00
fmc
fpga	fpga: dfl: fme: fix return value check in in pr_mgmt_init()	2018-09-12 09:31:00 +02:00
fsi	fsi: sbefifo: Bump max command length	2018-08-08 15:44:47 +10:00
gnss
gpio	gpio: Fix crash due to registration race	2018-08-31 11:30:45 +02:00
gpu	Merge branch 'drm-fixes-4.19' of git://people.freedesktop.org/~agd5f/linux into drm-fixes	2018-09-28 09:30:22 +10:00
hid	HID: i2c-hid: Don't reset device upon system resume	2018-09-06 16:30:53 +02:00
hsi
hv	vmbus: don't return values for uninitalized channels	2018-09-12 09:31:00 +02:00
hwmon	Various bug fixes for nct6775 driver	2018-09-19 22:59:30 +02:00
hwspinlock	hwspinlock: Fix incorrect return pointers	2018-07-30 20:54:51 -07:00
hwtracing	intel_th: pci: Add Ice Lake PCH support	2018-09-18 16:08:38 +02:00
i2c	i2c: xiic: Make the start and the byte count write atomic	2018-09-06 20:49:09 +02:00
ide	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide	2018-08-22 07:40:33 -07:00
idle
iio	First set of IIO fixes for the 4.19 cycle.	2018-09-09 09:33:29 +02:00
infiniband	Second rc pull request	2018-09-27 21:53:55 +02:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2018-09-28 18:04:50 -07:00
iommu	iommu/amd: Return devid as alias for ACPI HID devices	2018-09-26 09:41:11 +02:00
ipack
irqchip	irqchip/gic-v3-its: Cap lpi_id_bits to reduce memory footprint	2018-09-06 20:31:59 +02:00
isdn	isdn: Disable IIOCDBGVAR	2018-08-16 12:26:24 -07:00
leds	leds: ns2: Change unsigned to unsigned int	2018-08-06 23:03:12 +02:00
lightnvm
macintosh	macintosh: therm_windtunnel: drop using attach_adapter	2018-08-24 14:42:42 +02:00
mailbox	mailbox: Add support for i.MX messaging unit	2018-08-15 09:53:07 +05:30
mcb
md	for-linus-20180929	2018-09-29 14:52:14 -07:00
media	media: platform: fix cros-ec-cec build error	2018-09-17 14:32:29 -04:00
memory	memory: ti-aemif: fix a potential NULL-pointer dereference	2018-09-06 10:04:07 -07:00
memstick
message	scsi: message: fusion: Replace GFP_ATOMIC with GFP_KERNEL	2018-07-30 23:17:53 -04:00
mfd	mfd: omap-usb-host: Fix dts probe of children	2018-09-11 16:47:33 +01:00
misc	eeprom: at24: fix unexpected timeout under high load	2018-10-02 16:58:21 +02:00
mmc	mmc: meson-mx-sdio: fix OF child-node lookup	2018-09-05 08:28:45 +02:00
mtd	mtd: devices: m25p80: Make sure the buffer passed in op is DMA-able	2018-09-18 10:17:48 +02:00
mux	mux: adgs1408: new driver for Analog Devices ADGS1408/1409 mux	2018-08-02 10:23:02 +02:00
net	Second rc pull request	2018-09-27 21:53:55 +02:00
nfc
ntb
nubus
nvdimm	libnvdimm-for-4.19_dax-memory-failure	2018-08-25 18:43:59 -07:00
nvme	nvme: properly propagate errors in nvme_mpath_init	2018-09-25 16:21:40 -07:00
nvmem
of	Devicetree fixes for 4.19, part 2:	2018-09-14 13:03:17 -10:00
opp
oprofile
parisc
parport	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
pci	pci-v4.19-fixes-2	2018-09-28 18:20:41 +02:00
pcmcia	pcmcia: remove long deprecated pcmcia_request_exclusive_irq() function	2018-08-18 12:30:42 -07:00
perf	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
phy	Merge 4.18-rc7 into usb-next	2018-07-30 10:04:58 +02:00
pinctrl	Revert "pinctrl: intel: Do pin translation when lock IRQ"	2018-09-25 12:50:00 +02:00
platform	platform/x86: alienware-wmi: Correct a memory leak	2018-09-10 13:45:43 -07:00
pnp
power	treewide: convert ISO_8859-1 text comments to utf-8	2018-08-23 18:48:43 -07:00
powercap
pps
ps3
ptp	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
pwm	pwm: mediatek: Add MT7628 support	2018-08-20 11:36:07 +02:00
rapidio	drivers/rapidio/devices/rio_mport_cdev.c: remove redundant pointer md	2018-08-22 10:52:51 -07:00
ras
regulator	regulator: fix crash caused by null driver data	2018-09-20 09:04:51 -07:00
remoteproc	remoteproc/davinci: use the reset framework	2018-08-16 17:39:55 -07:00
reset	ARM: SoC: late updates	2018-08-25 14:12:36 -07:00
rpmsg	rpmsg: Add compat ioctl for rpmsg char driver	2018-07-30 23:40:23 -07:00
rtc	RTC for 4.19	2018-08-20 16:30:27 -07:00
s390	s390 fixes for 4.19-rc4	2018-09-13 16:22:24 -10:00
sbus
scsi	scsi: sd: don't crash the host on invalid commands	2018-09-21 12:42:57 -04:00
sfi
sh	sh: introduce a sh_cacheop_vaddr helper	2018-08-02 13:54:06 +02:00
siox
slimbus
sn
soc	ARM: Device-tree updates	2018-08-23 14:02:22 -07:00
soundwire	soundwire: Fix acquiring bus lock twice during master release	2018-08-27 09:49:48 +05:30
spi	spi: Fixes for v4.19	2018-09-28 18:04:06 -07:00
spmi
ssb	ssb: Remove SSB_WARN_ON, SSB_BUG_ON and SSB_DEBUG	2018-08-09 18:47:47 +03:00
staging	media fixes for v4.19-rc5	2018-09-24 15:16:41 +02:00
target	scsi: target: iscsi: Use bin2hex instead of a re-implementation	2018-09-21 12:32:30 -04:00
tc
tee	ARM: SoC driver updates	2018-08-23 13:52:46 -07:00
thermal	Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal	2018-08-28 16:11:34 -07:00
thunderbolt
tty	serial: imx: restore handshaking irq for imx1	2018-09-20 14:51:31 +02:00
uio	Char/Misc fix for 4.19-rc1	2018-08-19 09:30:44 -07:00
usb	usb: typec: mux: Take care of driver module reference counting	2018-09-20 13:35:01 +02:00
uwb
vfio	powerpc updates for 4.19	2018-08-17 11:32:50 -07:00
vhost	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-08-27 11:59:39 -07:00
video	fbdev changes for v4.19:	2018-08-23 15:44:58 -07:00
virt
virtio	virtio, vhost: fixes, tweaks	2018-08-24 08:45:19 -07:00
visorbus
vlynq
vme
w1	power supply and reset changes for the v4.19 series	2018-08-21 18:06:27 -07:00
watchdog	include/linux/compiler*.h: make compiler-*.h mutually exclusive	2018-08-22 17:31:34 -07:00
xen	xen: issue warning message when out of grant maptrack entries	2018-09-19 11:27:42 -04:00
zorro
Kconfig
Makefile	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00