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Commit 5ef5f72f authored by Dave Airlie's avatar Dave Airlie
Browse files

drm/kms: teardown crtc correctly when fb is destroyed. 



If userspace destroys a framebuffer that is in use on a crtc,
don't just null it out, tear down the crtc properly so the
hw gets turned off.

Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 6a719e05

drivers/gpu/drm/drm_crtc.c

+12 −28
Original line number Diff line number Diff line
@@ -257,31 +257,6 @@ void *drm_mode_object_find(struct drm_device *dev, uint32_t id, uint32_t type) 
}

EXPORT_SYMBOL(drm_mode_object_find);



/**

 * drm_crtc_from_fb - find the CRTC structure associated with an fb

 * @dev: DRM device

 * @fb: framebuffer in question

 *

 * LOCKING:

 * Caller must hold mode_config lock.

 *

 * Find CRTC in the mode_config structure that matches @fb.

 *

 * RETURNS:

 * Pointer to the CRTC or NULL if it wasn't found.

 */

struct drm_crtc *drm_crtc_from_fb(struct drm_device *dev,

				  struct drm_framebuffer *fb)

{

	struct drm_crtc *crtc;



	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {

		if (crtc->fb == fb)

			return crtc;

	}

	return NULL;

}



/**

 * drm_framebuffer_init - initialize a framebuffer

 * @dev: DRM device
@@ -328,11 +303,20 @@ void drm_framebuffer_cleanup(struct drm_framebuffer *fb) 
{

	struct drm_device *dev = fb->dev;

	struct drm_crtc *crtc;

	struct drm_mode_set set;

	int ret;



	/* remove from any CRTC */

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {

		if (crtc->fb == fb)

			crtc->fb = NULL;

		if (crtc->fb == fb) {

			/* should turn off the crtc */

			memset(&set, 0, sizeof(struct drm_mode_set));

			set.crtc = crtc;

			set.fb = NULL;

			ret = crtc->funcs->set_config(&set);

			if (ret)

				DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);

		}

	}



	drm_mode_object_put(dev, &fb->base);