diff options
| author | Sergei Antonov <saproj@gmail.com> | 2014-05-12 02:30:48 +0400 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2014-06-02 07:36:52 +0400 |
| commit | ba6f582606655754d9dfbfc9dffe75dcf806f1dd (patch) | |
| tree | 961f8ce74100a644269992fe82840ba798db6d37 /drivers/gpu/drm/drm_crtc_helper.c | |
| parent | 3640da2faa952a2e9439a254c1ce76033ca0a6dc (diff) | |
| download | linux-ba6f582606655754d9dfbfc9dffe75dcf806f1dd.tar.xz | |
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>
Diffstat (limited to 'drivers/gpu/drm/drm_crtc_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_crtc_helper.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c index df281b54db01..872ba11c4533 100644 --- a/drivers/gpu/drm/drm_crtc_helper.c +++ b/drivers/gpu/drm/drm_crtc_helper.c @@ -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; |