[PATCH v4 1/2] watchdog: Add a new flag WDIOF_STOP_MAYSLEEP

[Guenter Roeck]

On 3/5/25 03:01, Ahmad Fatoum wrote:
> Hi George,
> Hi Guenter,
> 
> On 05.03.25 11:34, George Cherian wrote:
>>> why is armada_37xx_wdt also here?
>>> The stop function in that driver may not sleep.
>> Marek,
>>
>> Thanks for reviewing.
>> Since the stop function has a regmap_write(), I thought it might sleep.
>> Now that you pointed it out, I assume that it is an MMIO based regmap being used for armada.
>> I will update the same in the next version
> 
> Failure to add WDIOF_STOP_MAYSLEEP when it's needed can lead to
> kernel hanging. Failure to add an alternative WDIOF_STOP_ATOMIC
> would lead to the kernel option being a no-op.
> 
> I think a no-op stop_on_panic (or reset_on_panic) is a saner default.
> 

Agreed. Also, I like WDIOF_STOP_ATOMIC more than the WDIOF_STOP_NOSLEEP
I had suggested in my other response.

Thanks,
Guenter