drm/i915: Move list of timelines under its own lock

Currently, the list of timelines is serialised by the struct_mutex, but
to alleviate difficulties with using that mutex in future, move the
list management under its own dedicated mutex.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190128102356.15037-5-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_reset.c

@@ -854,7 +854,8 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915)
 	 *
 	 * No more can be submitted until we reset the wedged bit.
 	 */
-	list_for_each_entry(tl, &i915->gt.timelines, link) {
+	mutex_lock(&i915->gt.timelines.mutex);
+	list_for_each_entry(tl, &i915->gt.timelines.list, link) {
 		struct i915_request *rq;
 		long timeout;
 
@@ -876,9 +877,12 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915)
 		timeout = dma_fence_default_wait(&rq->fence, true,
 						 MAX_SCHEDULE_TIMEOUT);
 		i915_request_put(rq);
-		if (timeout < 0)
+		if (timeout < 0) {
+			mutex_unlock(&i915->gt.timelines.mutex);
 			goto unlock;
+		}
 	}
+	mutex_unlock(&i915->gt.timelines.mutex);
 
 	intel_engines_sanitize(i915, false);