[Intel-gfx] [PATCH 2/2] drm/i915: debugfs/i915_gem_interrupt_info does not struct_mutex

[Chris Wilson]

i915_gem_interrupt_info() owns looks at mmio registers, and the waiters
under a spinlock. It doesn't need struct_mutex (but does need the rpm
wakelock for mmio access). Maybe useful using get_if_notidle?

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d4176c4d1c42..c02763de802f 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -726,13 +726,9 @@ static int i915_gem_seqno_info(struct seq_file *m, void *data)
 static int i915_interrupt_info(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *dev_priv = node_to_i915(m->private);
-	struct drm_device *dev = &dev_priv->drm;
 	struct intel_engine_cs *engine;
-	int ret, i, pipe;
+	int i, pipe;
 
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
-	if (ret)
-		return ret;
 	intel_runtime_pm_get(dev_priv);
 
 	if (IS_CHERRYVIEW(dev_priv)) {
@@ -908,7 +904,6 @@ static int i915_interrupt_info(struct seq_file *m, void *data)
 		i915_ring_seqno_info(m, engine);
 	}
 	intel_runtime_pm_put(dev_priv);
-	mutex_unlock(&dev->struct_mutex);
 
 	return 0;
 }
-- 
2.9.3