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Commit ec9f932e authored by Maarten Lankhorst's avatar Maarten Lankhorst Committed by Daniel Vetter
Browse files

drm/atomic: Cleanup on error properly in the atomic ioctl. 



It's probably allowed to leave old_fb set to garbage when unlocking,
but to prevent undefined behavior unset it just in case.

Also crtc_state->event could be NULL on memory allocation failure,
in which case event_space is increased for no reason.

Note: Contains some general simplification of the cleanup code too.

Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
[danvet: Add note about the other changes in here. And fix long line
while at it.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 3cb43cc0

drivers/gpu/drm/drm_atomic.c

+30 −34
Original line number Diff line number Diff line
@@ -1463,18 +1463,18 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, 


		if (get_user(obj_id, objs_ptr + copied_objs)) {

			ret = -EFAULT;

			goto fail;

			goto out;

		}



		obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY);

		if (!obj || !obj->properties) {

			ret = -ENOENT;

			goto fail;

			goto out;

		}



		if (get_user(count_props, count_props_ptr + copied_objs)) {

			ret = -EFAULT;

			goto fail;

			goto out;

		}



		copied_objs++;
@@ -1486,25 +1486,25 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, 


			if (get_user(prop_id, props_ptr + copied_props)) {

				ret = -EFAULT;

				goto fail;

				goto out;

			}



			prop = drm_property_find(dev, prop_id);

			if (!prop) {

				ret = -ENOENT;

				goto fail;

				goto out;

			}



			if (copy_from_user(&prop_value,

					   prop_values_ptr + copied_props,

					   sizeof(prop_value))) {

				ret = -EFAULT;

				goto fail;

				goto out;

			}



			ret = atomic_set_prop(state, obj, prop, prop_value);

			if (ret)

				goto fail;

				goto out;



			copied_props++;

		}
@@ -1523,7 +1523,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, 
			e = create_vblank_event(dev, file_priv, arg->user_data);

			if (!e) {

				ret = -ENOMEM;

				goto fail;

				goto out;

			}



			crtc_state->event = e;
@@ -1533,6 +1533,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, 
	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {

		ret = drm_atomic_check_only(state);

		/* _check_only() does not free state, unlike _commit() */

		if (!ret)

			drm_atomic_state_free(state);

	} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {

		ret = drm_atomic_async_commit(state);
@@ -1540,6 +1541,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, 
		ret = drm_atomic_commit(state);

	}



out:

	/* if succeeded, fixup legacy plane crtc/fb ptrs before dropping

	 * locks (ie. while it is still safe to deref plane->state).  We

	 * need to do this here because the driver entry points cannot
@@ -1552,41 +1554,35 @@ int drm_mode_atomic_ioctl(struct drm_device *dev, 
				drm_framebuffer_reference(new_fb);

			plane->fb = new_fb;

			plane->crtc = plane->state->crtc;

		} else {

			plane->old_fb = NULL;

		}

		if (plane->old_fb) {



			if (plane->old_fb)

				drm_framebuffer_unreference(plane->old_fb);

			plane->old_fb = NULL;

		}

		plane->old_fb = NULL;

	}



	drm_modeset_drop_locks(&ctx);

	drm_modeset_acquire_fini(&ctx);



	return ret;



fail:

	if (ret == -EDEADLK)

		goto backoff;

	if (ret == -EDEADLK) {

		drm_atomic_state_clear(state);

		drm_modeset_backoff(&ctx);

		goto retry;

	}



	if (ret) {

		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {

			for_each_crtc_in_state(state, crtc, crtc_state, i) {

			destroy_vblank_event(dev, file_priv, crtc_state->event);

			crtc_state->event = NULL;

				if (!crtc_state->event)

					continue;



				destroy_vblank_event(dev, file_priv,

						     crtc_state->event);

			}

		}



		drm_atomic_state_free(state);

	}



	drm_modeset_drop_locks(&ctx);

	drm_modeset_acquire_fini(&ctx);



	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_modeset_backoff(&ctx);



	goto retry;

}