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Groups > linux.kernel > #1443310

[RFC 0/3] watchdog: introduce open deadline

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If a watchdog driver tells the framework that the device is running,
the framework takes care of feeding the watchdog until userspace opens
the device. If the userspace application which is supposed to do that
never comes up properly, the watchdog is fed indefinitely by the
kernel. This can be especially problematic for embedded devices.

These patches allow one to set a maximum time for which the kernel
will feed the watchdog, thus ensuring that either userspace has come
up, or the board gets reset. This allows fallback logic in the
bootloader to attempt some recovery (for example, if an automatic
update is in progress, it could roll back to the previous version).

The patches have been tested on a Raspberry Pi 2 (with a suitably
modified driver for setting WDOG_HW_RUNNING - patches will be
submitted seperately) and a Wandboard.

Rasmus Villemoes (3):
  watchdog: change watchdog_need_worker logic
  watchdog: introduce watchdog_worker_should_ping helper
  watchdog: introduce CONFIG_WATCHDOG_OPEN_DEADLINE

 drivers/watchdog/Kconfig        | 21 +++++++++++++++
 drivers/watchdog/watchdog_dev.c | 60 ++++++++++++++++++++++++++++++++++++-----
 2 files changed, 74 insertions(+), 7 deletions(-)

-- 
2.5.0

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[RFC 0/3] watchdog: introduce open deadline Rasmus Villemoes <rasmus.villemoes@prevas.dk> - 2016-07-14 11:30 +0200
  [RFC 2/3] watchdog: introduce watchdog_worker_should_ping helper Rasmus Villemoes <rasmus.villemoes@prevas.dk> - 2016-07-14 11:30 +0200
  [RFC 1/3] watchdog: change watchdog_need_worker logic Rasmus Villemoes <rasmus.villemoes@prevas.dk> - 2016-07-14 11:30 +0200
    Re: [RFC 1/3] watchdog: change watchdog_need_worker logic Guenter Roeck <linux@roeck-us.net> - 2016-07-14 22:50 +0200
    Re: [RFC 1/3] watchdog: change watchdog_need_worker logic Wim Van Sebroeck <wim@iguana.be> - 2016-07-17 21:50 +0200
      Re: [RFC 1/3] watchdog: change watchdog_need_worker logic Guenter Roeck <linux@roeck-us.net> - 2016-07-17 22:00 +0200
        Re: [RFC 1/3] watchdog: change watchdog_need_worker logic Wim Van Sebroeck <wim@iguana.be> - 2016-07-17 22:40 +0200
  [RFC 3/3] watchdog: introduce CONFIG_WATCHDOG_OPEN_DEADLINE Rasmus Villemoes <rasmus.villemoes@prevas.dk> - 2016-07-14 11:30 +0200
    Re: [RFC 3/3] watchdog: introduce CONFIG_WATCHDOG_OPEN_DEADLINE Guenter Roeck <linux@roeck-us.net> - 2016-07-14 16:50 +0200
      Re: [RFC 3/3] watchdog: introduce CONFIG_WATCHDOG_OPEN_DEADLINE Rasmus Villemoes <rasmus.villemoes@prevas.dk> - 2016-07-15 09:50 +0200
        Re: [RFC 3/3] watchdog: introduce CONFIG_WATCHDOG_OPEN_DEADLINE Guenter Roeck <linux@roeck-us.net> - 2016-07-15 16:30 +0200
          Re: [RFC 3/3] watchdog: introduce CONFIG_WATCHDOG_OPEN_DEADLINE Rasmus Villemoes <rasmus.villemoes@prevas.dk> - 2016-07-21 00:20 +0200
            Re: [RFC 3/3] watchdog: introduce CONFIG_WATCHDOG_OPEN_DEADLINE Guenter Roeck <linux@roeck-us.net> - 2016-07-21 02:40 +0200

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