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drm/i915: debugfs/i915_gem_interrupt_info does not need struct_mutex 

i915_gem_interrupt_info() only 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@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20160903065343.25151-2-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
This commit is contained in:
Chris Wilson 2016-09-03 07:53:43 +01:00
parent 02c53d99b6
commit 4bb05040fd
1 changed files with 1 additions and 6 deletions
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7
drivers/gpu/drm/i915/i915_debugfs.c
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@ -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;
}