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drm/crtc-helper: skip locking checks in panicking path 

Skip locking checks in drm_helper_*_in_use() if they are called in panicking
path. See similar code in drm_warn_on_modeset_not_all_locked().

After panic information has been output, these WARN_ONs go off outputing a lot
of lines and scrolling the panic information out of the screen. Here is a
partial call trace showing how execution reaches them:

? drm_helper_crtc_in_use()
? __drm_helper_disable_unused_functions()
? several *_set_config functions
? drm_fb_helper_restore_fbdev_mode()

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Sergei Antonov 2014-05-12 00:30:48 +02:00 committed by Dave Airlie
parent 3640da2faa
commit ba6f582606
1 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/drm_crtc_helper.c
View File

@ -29,6 +29,7 @@
* Jesse Barnes <jesse.barnes@intel.com>
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/moduleparam.h>
@ -88,7 +89,13 @@ bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
struct drm_connector *connector;
struct drm_device *dev = encoder->dev;
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
/*
* We can expect this mutex to be locked if we are not panicking.
* Locking is currently fubar in the panic handler.
*/
if (!oops_in_progress)
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
if (connector->encoder == encoder)
return true;
@ -112,7 +119,13 @@ bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
struct drm_encoder *encoder;
struct drm_device *dev = crtc->dev;
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
/*
* We can expect this mutex to be locked if we are not panicking.
* Locking is currently fubar in the panic handler.
*/
if (!oops_in_progress)
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
return true;