Re: [PATCH] powerpc/powernv: handle OPAL_SUCCESS return in opal_sensor_read

Cedric Le Goater [off-list ref] writes:

The sensor service in OPAL only handles one FSP request at a time and 
returns OPAL_BUSY if one is already in progress. The lock covers this case 
but we could also remove it return EBUSY to the driver or even retry the 
call. That might be dangerous though. 

Retrying the call should be okay.

Just because FSP wants to do things serially doesn't mean non-FSP does :)

Changing OPAL to handle simultaneously multiple requests does not seem really 
necessary, it won't speed up the communication with the FSP and that is the
main bottleneck.

Only on FSP systems though, and all of the OpenPower machines don't have
FSPs :)