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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>
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@ -726,13 +726,9 @@ static int i915_gem_seqno_info(struct seq_file *m, void *data)
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static int i915_interrupt_info(struct seq_file *m, void *data)
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{
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struct drm_i915_private *dev_priv = node_to_i915(m->private);
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struct drm_device *dev = &dev_priv->drm;
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struct intel_engine_cs *engine;
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int ret, i, pipe;
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int i, pipe;
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ret = mutex_lock_interruptible(&dev->struct_mutex);
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if (ret)
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return ret;
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intel_runtime_pm_get(dev_priv);
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if (IS_CHERRYVIEW(dev_priv)) {
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@ -908,7 +904,6 @@ static int i915_interrupt_info(struct seq_file *m, void *data)
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i915_ring_seqno_info(m, engine);
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}
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intel_runtime_pm_put(dev_priv);
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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