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@xxxxxxxxxxxxxxxxxx>
---
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
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