drm: Fixup locking WARNINGs in drm_mode_config_reset
With
commit 7a3f3d6667f5f9ffd1517f6b21d64bbf5312042c
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu Jul 9 23:44:28 2015 +0200
drm: Check locking in drm_for_each_connector
we started checking the locking in drm_for_each_connector but somehow
I totally missed drm_mode_config_reset. There's no problem there since
this function should only be called in single-threaded contexts
(driver load or resume), so just wrap the loop with the right lock.
v2: Drink coffee and all that ...
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index dfac394..7d02e32 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5273,12 +5273,14 @@
if (encoder->funcs->reset)
encoder->funcs->reset(encoder);
+ mutex_lock(&dev->mode_config.mutex);
drm_for_each_connector(connector, dev) {
connector->status = connector_status_unknown;
if (connector->funcs->reset)
connector->funcs->reset(connector);
}
+ mutex_unlock(&dev->mode_config.mutex);
}
EXPORT_SYMBOL(drm_mode_config_reset);