4.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: Matthew Auld <matthew.a...@intel.com> commit e411072d5740a49cdc9d0713798c30440757e451 upstream. We grab the struct_mutex in intel_crtc_page_flip, but if we are wedged or a reset is in progress we bail early but never seem to actually release the lock. Fixes: 7f1847ebf48b ("drm/i915: Simplify checking of GPU reset_counter in display pageflips") Cc: Chris Wilson <ch...@chris-wilson.co.uk> Signed-off-by: Matthew Auld <matthew.a...@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161128103648.9235-1-matthew.a...@intel.com Reviewed-by: Joonas Lahtinen <joonas.lahti...@linux.intel.com> Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> (cherry picked from commit ddbb271aea87fc6004d3c8bcdb0710e980c7ec85) Signed-off-by: Jani Nikula <jani.nik...@intel.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/gpu/drm/i915/intel_display.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -11791,7 +11791,7 @@ static int intel_crtc_page_flip(struct d intel_crtc->reset_counter = i915_reset_counter(&dev_priv->gpu_error); if (__i915_reset_in_progress_or_wedged(intel_crtc->reset_counter)) { ret = -EIO; - goto cleanup; + goto unlock; } atomic_inc(&intel_crtc->unpin_work_count); @@ -11877,6 +11877,7 @@ cleanup_pending: if (!IS_ERR_OR_NULL(request)) i915_add_request_no_flush(request); atomic_dec(&intel_crtc->unpin_work_count); +unlock: mutex_unlock(&dev->struct_mutex); cleanup: crtc->primary->fb = old_fb;