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04b1a62e6b
linux/drivers/watchdog
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Doug Anderson 04b1a62e6b watchdog: dw_wdt: keepalive the watchdog at write time 
If you've got code that does this in a tight loop
  1. Open watchdog
  2. Send 'expect close'
  3. Close watchdog
...you'll eventually trigger a watchdog reset.  You can reproduce this
by using daisydog (1) and running:
  while true; do daisydog -c > /dev/null; done

The problem is that each time you write to the watchdog for 'expect
close' it moves the timer .5 seconds out.  The timer thus never fires
and never pats the watchdog for you.

1: http://git.chromium.org/gitweb/?p=chromiumos/third_party/daisydog.git

Signed-off-by: Doug Anderson <dianders@chromium.org>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2015-06-22 15:54:31 +02:00
..
acquirewdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
advantechwdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
alim1535_wdt.c watchdog: remove DEFINE_PCI_DEVICE_TABLE macro 2014-01-28 19:07:07 +01:00
alim7101_wdt.c watchdog: alim7101: register restart handler with kernel restart handler 2014-09-26 00:00:32 -07:00
ar7_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
at32ap700x_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
at91rm9200_wdt.c watchdog: at91rm9200: implement restart handler 2015-03-16 17:03:02 +01:00
at91sam9_wdt.c watchdog: at91sam9: use endian agnostic IO 2015-06-22 15:53:57 +02:00
at91sam9_wdt.h
ath79_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
bcm47xx_wdt.c watchdog: bcm47xx_wdt.c: add restart handler support 2015-02-17 21:33:27 +01:00
bcm63xx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
bcm2835_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
bcm_kona_wdt.c watchdog: bcm281xx: Remove use of seq_printf return value 2015-04-22 15:27:39 +02:00
bfin_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
booke_wdt.c powerpc: booke_wdt: Fix build error as a module 2014-10-20 20:44:22 +02:00
cadence_wdt.c watchdog: drop owner assignment from platform_drivers 2015-01-21 14:52:34 +01:00
coh901327_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
cpu5wdt.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
cpwd.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
da9052_wdt.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
da9055_wdt.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
da9063_wdt.c watchdog: da9063: Add restart handler support 2015-02-17 21:33:06 +01:00
davinci_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
diag288_wdt.c s390/watchdog: support for KVM hypervisors and delete pr_info messages 2015-03-25 11:49:42 +01:00
digicolor_wdt.c watchdog: digicolor: driver for Conexant Digicolor CX92755 SoC 2015-06-22 15:53:59 +02:00
dw_wdt.c watchdog: dw_wdt: keepalive the watchdog at write time 2015-06-22 15:54:31 +02:00
ep93xx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
eurotechwdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
f71808e_wdt.c
gef_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
geodewdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
gpio_wdt.c watchdog: gpio_wdt: Add "always_running" feature to GPIO watchdog 2015-02-17 21:33:22 +01:00
hpwdt.c watchdog: hpwdt: Fix initialization message in hpwdt.c 2015-02-17 21:32:10 +01:00
i6300esb.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
ib700wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ibmasr.c watchdog: fix checkpatch warnings and error 2014-03-31 13:31:06 +02:00
ie6xx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
imgpdc_wdt.c watchdog: imgpdc: Add some documentation about the timeout 2015-06-22 15:54:15 +02:00
imx2_wdt.c watchdog: imx2_wdt: also set wdog->timeout to new_timeout 2015-06-22 15:54:25 +02:00
indydog.c watchdog: indydog: Simplify indydog_{start,stop} 2014-03-31 13:26:31 +02:00
intel_scu_watchdog.c watchdog: intel_scu_watchdog: Remove unused variable 2014-03-31 13:26:56 +02:00
intel_scu_watchdog.h
intel-mid_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
iop_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
it87_wdt.c watchdog: it87_wdt: add IT8783 ID 2015-02-17 21:32:08 +01:00
it8712f_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
iTCO_vendor_support.c
iTCO_vendor.h
iTCO_wdt.c PM / watchdog: iTCO: stop watchdog during system suspend 2015-04-03 15:25:04 +02:00
ixp4xx_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
jz4740_wdt.c watchdog: jz4740: Add DT support 2015-02-17 21:34:09 +01:00
Kconfig watchdog: Allow compile test of GPIO consumers if !GPIOLIB 2015-06-22 15:54:24 +02:00
kempld_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ks8695_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
lantiq_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
m54xx_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
machzwd.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
Makefile watchdog: digicolor: driver for Conexant Digicolor CX92755 SoC 2015-06-22 15:53:59 +02:00
max63xx_wdt.c watchdog: max63xx_wdt: Constify platform_device_id 2015-06-22 15:54:22 +02:00
mena21_wdt.c watchdog: New watchdog driver for MEN A21 watchdogs 2013-07-11 22:19:05 +02:00
menf21bmc_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
meson_wdt.c watchdog: drop owner assignment from platform_drivers 2015-01-21 14:52:34 +01:00
mixcomwd.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
moxart_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
mpc8xxx_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
mtk_wdt.c watchdog: mtk_wdt: signedness bug in mtk_wdt_start() 2015-03-27 08:47:36 +01:00
mtx-1_wdt.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
mv64x60_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
nuc900_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
nv_tco.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
nv_tco.h
octeon-wdt-main.c watchdog: octeon: use fixed length string for register names 2015-04-22 15:28:40 +02:00
octeon-wdt-nmi.S
of_xilinx_wdt.c watchdog: xilinx: Remove .owner field for driver 2014-10-20 20:43:42 +02:00
omap_wdt.c watchdog: omap: assert the counter being stopped before reprogramming 2015-06-22 15:54:07 +02:00
omap_wdt.h
orion_wdt.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
pc87413_wdt.c watchdog: fix checkpatch warnings and error 2014-03-31 13:31:06 +02:00
pcwd_pci.c watchdog: remove DEFINE_PCI_DEVICE_TABLE macro 2014-01-28 19:07:07 +01:00
pcwd_usb.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
pcwd.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
pika_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
pnx833x_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
pnx4008_wdt.c watchdog: pnx4008_wdt: fix broken email address 2015-04-22 15:30:41 +02:00
qcom-wdt.c watchdog: qcom: use timer devicetree binding 2015-04-22 15:27:47 +02:00
rc32434_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
rdc321x_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
retu_wdt.c watchdog: Fix omap watchdogs to enable the magic close bit 2015-02-17 21:32:36 +01:00
riowd.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
rn5t618_wdt.c watchdog: add driver for Ricoh RN5T618 watchdog 2014-10-20 20:55:02 +02:00
rt2880_wdt.c watchdog: rt2880_wdt: minor clean up 2015-02-17 21:32:21 +01:00
s3c2410_wdt.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
sa1100_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
sb_wdog.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
sbc60xxwdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
sbc7240_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
sbc8360.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
sbc_epx_c3.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
sbc_fitpc2_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
sc520_wdt.c watchdog: sc520_wdt: Remove unused variable 2014-03-31 13:27:34 +02:00
sc1200wdt.c sc1200_wdt: Fix oops 2013-12-10 08:48:15 +01:00
sch311x_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
scx200_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
shwdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
sirfsoc_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
smsc37b787_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
softdog.c watchdog: fix checkpatch warnings and error 2014-03-31 13:31:06 +02:00
sp805_wdt.c watchdog: sp805: Set watchdog_device->timeout from ->set_timeout() 2014-06-10 21:47:47 +02:00
sp5100_tco.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
sp5100_tco.h
st_lpc_wdt.c watchdog: st_wdt: Update IP layout information to include Clocksource 2015-06-22 15:53:52 +02:00
stmp3xxx_rtc_wdt.c watchdog: stmp3xxx_rtc_wdt: fix broken email address 2015-04-22 15:30:45 +02:00
sunxi_wdt.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
tegra_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ts72xx_wdt.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
twl4030_wdt.c watchdog: Fix omap watchdogs to enable the magic close bit 2015-02-17 21:32:36 +01:00
txx9wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
ux500_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00
via_wdt.c watchdog: via_wdt: replace del_timer by del_timer_sync 2014-06-10 21:38:25 +02:00
w83627hf_wdt.c watchdog: w83627hf_wdt: Add support for NCT6791 and NCT6792 2015-02-17 21:33:37 +01:00
w83877f_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
w83977f_wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
wafer5823wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
watchdog_core.c watchdog: core: Make dt "timeout-sec" property work on drivers w/out min/max 2014-01-28 19:07:56 +01:00
watchdog_core.h
watchdog_dev.c watchdog: core: don't try to stop device if not running 2013-07-11 21:14:39 +02:00
wd501p.h
wdrtas.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
wdt285.c watchdog: wdt285: Fix variable type 2014-03-31 13:28:20 +02:00
wdt977.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
wdt_pci.c watchdog: delete non-required instances of include <linux/init.h> 2014-03-31 13:22:45 +02:00
wdt.c watchdog: Get rid of MODULE_ALIAS_MISCDEV statements 2013-11-17 19:38:13 +01:00
wm831x_wdt.c watchdog: Remove unnecessary OOM messages 2014-03-31 13:23:19 +02:00
wm8350_wdt.c
xen_wdt.c watchdog: drop owner assignment from platform_drivers 2014-10-20 16:21:56 +02:00