Commits
Chris Wilson committed e32da7adaf3
drm/i915: Protect gen7 irq_seqno_barrier with uncore lock Faced with sporadic machine hangs on gen7, that mimic the issue of concurrent writes to the same cacheline and seem to start with commit 9b9ed3093613 (drm/i915: Remove forcewake dance from seqno/irq barrier on legacy gen6+), let us restore the spinlock around the mmio read. Fixes: 9b9ed3093613 (drm/i915: Remove forcewake dance from seqno/irq...) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1461744121-27051-1-git-send-email-chris@chris-wilson.co.uk Tested-by: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com> (cherry picked from commit bcbdb6d01150dcc1769ddc9baaaf7f102f27f919) Signed-off-by: Jani Nikula <jani.nikula@intel.com>