Hi.

I have a doubt about suspending of timers.
I found the patch (not included to linux-next):
https://lkml.org/lkml/2014/7/21/493
but it concerns timers only.

I'm adding PM to the watchdog driver (below).
The driver is capable to stop the watchdog.
However I implemented "keep-on" feature to ping
active watchdog if userland doesn't do it.
For the feature I used a timer.
Now, on wdt_suspend() call I don't know
if timers are suspended before the watchdog driver or
there is no guarantee (race): wdt_suspend() calls wdt_stop()
and after timer's callback will ping watchdog and reenable it.

I found also:
https://lkml.org/lkml/2007/10/25/9
Here del_timer_sync() is called and it solves
the problem.
In my case the timer is serviced in watchdog_dev,
not in the specific-driver.
I can add a flag in the specific-driver
to block watchdog's ping before wdt_stop()
or export new function to suspend/resume
watchdog_dev's timer from the specific-driver.

Could you advice is it necessary?