What to do about hung firmware?

[Ben Greear]

On 11/05/2013 11:46 PM, Kalle Valo wrote:
> Michal Kazior <michal.kazior at tieto.com> writes:
> 
>> You probably could try WMI_ECHO_CMDID to implement a keep alive when
>> idling (i.e. not sending WMI commands for a few seconds at least).
> 
> Sending something periodically would be bad from power consumption point
> of view. We would need to either disable it by default, only send it if
> there's a problem or something like that.

Ok, how about this:

If we hit the 3*HZ timeout, then we send a ping to the firmware
even if we are out of tickets.

If we get no response to that in 3*HZ or so, then consider firmware
hung and reset it.

Thanks,
Ben

-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com