@@ -96,9 +96,18 @@ i915_gem_wait_for_error(struct drm_device *dev)
if (!atomic_read(&dev_priv->mm.wedged))
return 0;
- ret = wait_for_completion_interruptible(x);
- if (ret)
+ /*
+ * Only wait 10 seconds for the gpu reset to complete to avoid hanging
+ * userspace. If it takes that long something really bad is going on and
+ * we should simply try to bail out and fail as gracefully as possible.
+ */
+ ret = wait_for_completion_interruptible_timeout(x, 10*HZ);
+ if (ret == 0) {
+ DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
+ return -EIO;
+ } else if (ret < 0) {
return ret;
+ }
if (atomic_read(&dev_priv->mm.wedged)) {
/* GPU is hung, bump the completion count to account for
With the gpu reset no longer using a trylock we've increased the chances of userspace getting stuck quite a bit. To make that (hopefully) rare case more paletable time out when waiting for the gpu reset code to complete and signal this little issue to the caller by returning -EIO. This should help userspace to somewhat gracefully fall back and hopefully allow the user to grab some logs and reboot the machine (instead of staring at a frozen X screen in agony). Suggested by Chris Wilson because I've been stubborn about allowing the gpu reset code no to fail, ever (by removing the trylock). Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch> --- drivers/gpu/drm/i915/i915_gem.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)