[Skiboot] [PATCH] powerpc/powernv: handle OPAL_SUCCESS return in opal_sensor_read
stewart at linux.vnet.ibm.com
Fri Mar 27 17:05:45 AEDT 2015
Cedric Le Goater <clg at fr.ibm.com> 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
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