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Primoz Fiser 2f61b3a746 watchdog: da9062: da9063: prevent pings ahead of machine reset Proper machine resets via da9062/da9063 PMICs are very tricky as they require special i2c atomic transfers when interrupts are not available anymore. This is also a reason why both PMIC's restart handlers do not use regmap but instead opt for i2c_smbus_write_byte_data() which does i2c transfer in atomic manner. Under the hood, this function tries to obtain i2c bus lock with call to i2c_adapter_trylock_bus() which will return -EAGAIN (-11) if lock is not available. Since commit `982bb70517` ("watchdog: reset last_hw_keepalive time at start") occasional restart handler failures with "Failed to shutdown (err = -11)" error messages were observed, indicating that some process is holding the i2c bus lock. Investigation into the matter uncovered that sometimes during reboot sequence watchdog ping is issued late into poweroff/reboot phase which did not happen before mentioned commit (usually the watchdog ping happened immediately as commit message suggests). As of now, when watchdog ping usually happens late into poweroff/reboot stage when interrupts are not available anymore, i2c bus lock cannot be released anymore and pending restart handler in turn fails. Thus, to prevent such late watchdog pings from happening ahead of pending machine restart and consequently locking up the i2c bus, check for system_state in watchdog ping handler and consequently do not send pings anymore in case system_state > SYSTEM_RUNNING. Signed-off-by: Primoz Fiser <primoz.fiser@norik.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Link: https://lore.kernel.org/r/20210708082128.2832904-1-primoz.fiser@norik.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>		2021-10-26 21:31:05 +02:00
arch	powerpc fixes for 5.15 #4	2021-10-17 18:01:32 -10:00
block	block-5.15-2021-10-17	2021-10-17 19:25:20 -10:00
certs
crypto
Documentation	virtio,vdpa: fixes	2021-10-17 18:17:19 -10:00
drivers	watchdog: da9062: da9063: prevent pings ahead of machine reset	2021-10-26 21:31:05 +02:00
fs	io_uring-5.15-2021-10-17	2021-10-17 19:20:13 -10:00
include	block-5.15-2021-10-17	2021-10-17 19:25:20 -10:00
init	bootconfig: init: Fix memblock leak in xbc_make_cmdline()	2021-10-10 22:27:40 -04:00
ipc
kernel	Tracing fixes for 5.15:	2021-10-16 10:51:41 -07:00
lib	linux-kselftest-kunit-fixes-5.15-rc6	2021-10-11 17:25:08 -07:00
LICENSES
mm	memblock: exclude NOMAP regions from kmemleak	2021-10-13 08:36:59 +03:00
net	icmp: fix icmp_ext_echo_iio parsing in icmp_build_probe	2021-10-14 07:54:47 -07:00
samples
scripts	Tracing fixes for 5.15:	2021-10-16 10:51:41 -07:00
security
sound	ALSA: usb-audio: Add quirk for VF0770	2021-10-12 22:13:11 +02:00
tools	- Update section headers before the respective relocations to not	2021-10-17 17:41:39 -10:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	Char/Misc driver fixes for 5.15-rc6	2021-10-17 17:14:00 -10:00
Makefile	Linux 5.15-rc6	2021-10-17 20:00:13 -10:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.