Hi All, The following is a v2 version of the series [1] that fixes system hang which occurs when the ping worker fires after wdog suspend and before wdog resume. This happens because the ping worker can issue low-level ping while the wdog clk was disabled by the suspend routine (accessing hw wdog registers while they are not fed by the clk). To overcome this issue two patches were introduced. Patch #1 introduces pm notifier in the watchdog core which will call watchdog_dev_suspend/resume and actually cancel ping worker during suspend and restore it back, if needed, during resume. Patch #2 introduces relevant changes to imx2_wdt driver and notifies wdog core to stop ping worker on suspend. [1] https://lkml.org/lkml/2021/6/15/542 Best regards, Grzegorz Grzegorz Jaszczyk (2): watchdog: introduce watchdog_dev_suspend/resume watchdog: imx2_wdg: notify wdog core to stop ping worker on suspend drivers/watchdog/imx2_wdt.c | 1 + drivers/watchdog/watchdog_core.c | 37 +++++++++++++++++++++++++ drivers/watchdog/watchdog_dev.c | 47 ++++++++++++++++++++++++++++++++ include/linux/watchdog.h | 10 +++++++ 4 files changed, 95 insertions(+) -- 2.29.0
