From 8a270ebf341105b85aaf4f5e4336bb53b3c10177 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Tue, 17 Jun 2014 22:34:37 +0200 Subject: [PATCH] drm/i915: Grab dev->struct_mutex in i915_gem_pageflip_info We could walk of a bad list otherwise when someone concurrently unbinds stuff for fun. I've suspected this as the root-cause behind seemingly inconsistent state, but alas it's not. Acked-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_debugfs.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 8057fd4..76c2572 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -513,6 +513,11 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data) struct drm_device *dev = node->minor->dev; unsigned long flags; struct intel_crtc *crtc; + int ret; + + ret = mutex_lock_interruptible(&dev->struct_mutex); + if (ret) + return ret; for_each_intel_crtc(dev, crtc) { const char pipe = pipe_name(crtc->pipe); @@ -554,6 +559,8 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data) spin_unlock_irqrestore(&dev->event_lock, flags); } + mutex_unlock(&dev->struct_mutex); + return 0; } -- 2.7.4