Revert "drm/i915: Lock mode_config.mutex in intel_display_resume."

This reverts commit ea49c9a.

mode_config.mutex was originally added to fix WARNs in connector
functions, but now that atomic nonblocking modeset support is
included, we will likely never hold any any lock at all.

The WARN mentioned in commit bbf35e9 ("drm/i915:
Pass atomic state to intel_audio_codec_enable, v2."), so it's
safe to revert this now.

Signed-off-by: Maarten Lankhorst <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/1491312168-18147-1-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <[email protected]>

drivers/gpu/drm/i915/intel_display.c

@@ -15559,13 +15559,6 @@ void intel_display_resume(struct drm_device *dev)
 	if (state)
 		state->acquire_ctx = &ctx;
 
-	/*
-	 * This is a cludge because with real atomic modeset mode_config.mutex
-	 * won't be taken. Unfortunately some probed state like
-	 * audio_codec_enable is still protected by mode_config.mutex, so lock
-	 * it here for now.
-	 */
-	mutex_lock(&dev->mode_config.mutex);
 	drm_modeset_acquire_init(&ctx, 0);
 
 	while (1) {
@@ -15581,7 +15574,6 @@ void intel_display_resume(struct drm_device *dev)
 
 	drm_modeset_drop_locks(&ctx);
 	drm_modeset_acquire_fini(&ctx);
-	mutex_unlock(&dev->mode_config.mutex);
 
 	if (ret)
 		DRM_ERROR("Restoring old state failed with %i\n", ret);