[Intel-gfx] [PATCH] drm/i915/selftests: Handle a potential failure of intel_ring_begin

[Chris Wilson]

Quoting Oscar Mateo (2018-04-16 22:57:01)
> Silence smatch over:
> 
> drivers/gpu/drm/i915/selftests/intel_workarounds.c:58 read_nonprivs() error: 'cs' dereferencing possible ERR_PTR()
> 
> by handling a potential (but unlikely) failure of intel_ring_begin.
> 
> Fixes: f4ecfbfc32ed ("drm/i915: Check whitelist registers across resets")
> Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>

Serves me right for forgetting to check with smatch myself.

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris