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SubjectRe: [PATCH] drivers/i915: Fix unnoticed failure of init_ring_common()
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On Thu, Jun 19, 2014 at 12:38 AM, Konrad Zapalowicz
<bergo.torino@gmail.com> wrote:
> This commit add check for return value of init_ring_common() in the
> init_render_ring(). Now, when failure is detected the error code is
> propagated to the caller layer instead of being ignored.
>
> I believe that this fix will have a positive impact on the oops that
> I hit recently and which starts when init_ring_common() fails:
>
> [drm:init_ring_common] *ERROR* render ring initialization failed
> ctl 0001f001 head 0000000c tail 00000000 start 003eb000
> BUG: unable to handle kernel NULL pointer dereference at 0000006c
> IP: [<f8ca1679>] i915_gem_obj_to_ggtt+0x9/0x40 [i915]
>
> Signed-off-by: Konrad Zapalowicz <bergo.torino@gmail.com>

Do you have the full Oops somewhere?

> ---
> drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 279488a..d205b0d 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -604,6 +604,8 @@ static int init_render_ring(struct intel_engine_cs *ring)
> struct drm_device *dev = ring->dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> int ret = init_ring_common(ring);
> + if (ret)
> + return ret;

Yeah, on gen5+ this looks needed.
-Daniel

>
> /* WaTimedSingleVertexDispatch:cl,bw,ctg,elk,ilk,snb */
> if (INTEL_INFO(dev)->gen >= 4 && INTEL_INFO(dev)->gen < 7)
> --
> 1.8.1.2
>



--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch


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