On Mon, Mar 06, 2017 at 12:01:51AM +0100, Pavel Machek wrote:
> Hi!
>
> > > mplayer stopped working after a while. Dmesg says:
> > >
> > > [ 3000.266533] cdc_ether 2-1.2:1.0 usb0: register 'cdc_ether' at
>
> Now I'm pretty sure it is a regression in v4.11-rc0. Any ideas what to
> try? Bisect will be slow and nasty :-(.
I came the conclusion that #99671 is the ring HEAD overtaking the TAIL,
and under the presumption that your bug matches (as the symptoms do):
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 4ffa35faff49..62e31a7438ac 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -782,10 +782,10 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request)
{
struct drm_i915_private *dev_priv = request->i915;
- i915_gem_request_submit(request);
-
GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
I915_WRITE_TAIL(request->engine, request->tail);
+
+ i915_gem_request_submit(request);
}
static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs)
--
Chris Wilson, Intel Open Source Technology Centre
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