[PATCH] drm/i915/guc: Actually return an error if GuC version range check fails

[Andi Shyti]

Hi John,

> Dan Carpenter pointed out that 'err' was not being set in the case
> where the GuC firmware version range check fails. Fix that.
> 
> Note that while this is bug fix for a previous patch (see Fixes tag

is _a_ bug fix.

> below). It is an exceedingly low risk bug. The range check is
> asserting that the GuC firmware version is within spec. So it should
> not be possible to ever have a firmware file that fails this check. If
> larger version numbers are required in the future, that would be a
> backwards breaking spec change and thus require a major version bump,
> in which case an old i915 driver would not load that new version anyway.
> 
> Fixes: 9bbba0667f37 ("drm/i915/guc: Use GuC submission API version number")
> Reported-by: Dan Carpenter <error27 at gmail.com>
> Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
> Cc: John Harrison <John.C.Harrison at Intel.com>
> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
> Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Matthew Brost <matthew.brost at intel.com>
> Cc: Andi Shyti <andi.shyti at linux.intel.com>
> Cc: Matthew Auld <matthew.auld at intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> Cc: Jani Nikula <jani.nikula at intel.com>

Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com> 

Andi