drm/i915: Missed lock change with rps lock

Fixes a WARN_ON in igt/tests/debugfs_reader

CC: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 09cd7d76f6ae..4568e7d8a060 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1096,8 +1096,10 @@ static int gen6_drpc_info(struct seq_file *m)
 
         rpmodectl1 = I915_READ(GEN6_RP_CONTROL);
         rcctl1 = I915_READ(GEN6_RC_CONTROL);
-        sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, &rc6vids);
         mutex_unlock(&dev->struct_mutex);
+        mutex_lock(&dev_priv->rps.hw_lock);
+        sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, &rc6vids);
+        mutex_unlock(&dev_priv->rps.hw_lock);
 
         seq_printf(m, "Video Turbo Mode: %s\n",
                    yesno(rpmodectl1 & GEN6_RP_MEDIA_TURBO));