[Bug 99671] [v4.10 snb] weird seqno/request tracking - HEAD overtakes TAIL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99671

--- Comment #39 from Chris Wilson <chris at chris-wilson.co.uk> ---
Please try (pardon the tabs):


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)

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