[Intel-gfx] [PATCH 21/31] drm/i915: Convert engine->write_tail to operate on a request

[Chris Wilson]

On Wed, Jul 27, 2016 at 12:53:25PM +0100, Dave Gordon wrote:
> On 25/07/16 08:44, Chris Wilson wrote:
> >+static void i9xx_submit_request(struct drm_i915_gem_request *request)
> >+{
> >+	struct drm_i915_private *dev_priv = request->i915;
> >+
> >+	I915_WRITE_TAIL(request->engine,
> >+			request->tail % (request->ring->size - 1));
> >+}
> 
> Another "modulo ringsize-1" here too.

Because the original code included that safe guard against known GPU
hangs.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre