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Code Issues Releases Wiki Activity

drm: Fix locking cargo-cult in encoder/plane init/cleanup

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Encoders&planes can't be hotplugged, we dont need locking for this
since it's all single-threaded driver setup/teardown code. CRTCs
already don't grab locks.

While at it I noticed that plane's are missing the
drm_modeset_lock_fini() call, so add it.

Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161129094538.9650-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2016-11-29 10:45:38 +01:00
parent b07c42547b
commit 661a375561
2 changed files with 3 additions and 10 deletions
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9
drivers/gpu/drm/drm_encoder.c
View file

@ -110,11 +110,9 @@ int drm_encoder_init(struct drm_device *dev,
{
int ret;
drm_modeset_lock_all(dev);
ret = drm_mode_object_get(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
if (ret)
goto out_unlock;
return ret;
encoder->dev = dev;
encoder->encoder_type = encoder_type;
@ -142,9 +140,6 @@ int drm_encoder_init(struct drm_device *dev,
if (ret)
drm_mode_object_unregister(dev, &encoder->base);
out_unlock:
drm_modeset_unlock_all(dev);
return ret;
}
EXPORT_SYMBOL(drm_encoder_init);
@ -164,12 +159,10 @@ void drm_encoder_cleanup(struct drm_encoder *encoder)
* the indices on the drm_encoder after us in the encoder_list.
*/
drm_modeset_lock_all(dev);
drm_mode_object_unregister(dev, &encoder->base);
kfree(encoder->name);
list_del(&encoder->head);
dev->mode_config.num_encoder--;
drm_modeset_unlock_all(dev);
memset(encoder, 0, sizeof(*encoder));
}

4
drivers/gpu/drm/drm_plane.c
View file

@ -221,7 +221,8 @@ void drm_plane_cleanup(struct drm_plane *plane)
{
struct drm_device *dev = plane->dev;
drm_modeset_lock_all(dev);
drm_modeset_lock_fini(&plane->mutex);
kfree(plane->format_types);
drm_mode_object_unregister(dev, &plane->base);
@ -236,7 +237,6 @@ void drm_plane_cleanup(struct drm_plane *plane)
dev->mode_config.num_total_plane--;
if (plane->type == DRM_PLANE_TYPE_OVERLAY)
dev->mode_config.num_overlay_plane--;
drm_modeset_unlock_all(dev);
WARN_ON(plane->state && !plane->funcs->atomic_destroy_state);
if (plane->state && plane->funcs->atomic_destroy_state)