From c50b4bf6e25a3ce2b058a132f49335ac9fa67062 Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date: Tue, 4 Apr 2017 15:22:48 +0200
Subject: [PATCH] Revert "drm/i915: Lock mode_config.mutex in intel_display_resume."
Git-commit: c50b4bf6e25a3ce2b058a132f49335ac9fa67062
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

This reverts commit ea49c9acf2db7082f0406bb3a570cc6bad37082b.

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 bbf35e9defb9a6d1 ("drm/i915:
Pass atomic state to intel_audio_codec_enable, v2."), so it's
safe to revert this now.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1491312168-18147-1-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_display.c |    8 --------
 1 file changed, 8 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15573,13 +15573,6 @@ void intel_display_resume(struct drm_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) {
@@ -15595,7 +15588,6 @@ void intel_display_resume(struct drm_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);