[PATCH 5.10.y-cip 0/2] watchdog: iTCO_wdt: Backport patches to enable handle_boot_enabled=0

[Jan Kiszka <jan.kiszka@siemens.com>]

These patches are needed in order to make iTCO_wdt respect
handle_boot_enabled=0, i.e. to step back from a running watchdog until
userspace picks it up. Up to 5.16, the driver simply stopped the
watchdog which could have created a non-monitored window during boot-up
in the handover from the firmware starting it to userspace (typically
sytemd) safely driving. E.g., any infinite loops in the initramfs would
could have created a locked-up system.

These patches were proposed to the watchdog maintainers for official
stable integration  [1] but received no reaction so far. As the issue is critical for
CIP's OTA software update integration, let's use the CIP path instead.

I don't have any test setup for 4.19, so I'm only proposing this for
5.10 here.

Jan

[1] https://lore.kernel.org/linux-watchdog/e9c2d0a5-9618-b616-3be3-826cc0665388@siemens.com/T/#t

Mika Westerberg (2):
  watchdog: iTCO_wdt: No need to stop the timer in probe
  watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already
    running

 drivers/watchdog/iTCO_wdt.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

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2.35.3