Commit 29dc0d1d authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm: Roll out acquire context for the page_flip ioctl 



Again just prep work.

Reviewed-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-11-daniel.vetter@ffwll.ch
parent d26f96c7

drivers/gpu/drm/drm_plane.c

+19 −2
Original line number Diff line number Diff line
@@ -803,6 +803,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, 
	struct drm_framebuffer *fb = NULL;

	struct drm_pending_vblank_event *e = NULL;

	u32 target_vblank = page_flip->sequence;

	struct drm_modeset_acquire_ctx ctx;

	int ret = -EINVAL;



	if (!drm_core_check_feature(dev, DRIVER_MODESET))
@@ -866,7 +867,16 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, 
		return -EINVAL;

	}



	drm_modeset_lock_crtc(crtc, crtc->primary);

	drm_modeset_acquire_init(&ctx, 0);

retry:

	ret = drm_modeset_lock(&crtc->mutex, &ctx);

	if (ret)

		goto out;

	ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);

	if (ret)

		goto out;

	crtc->acquire_ctx = &ctx;



	if (crtc->primary->fb == NULL) {

		/* The framebuffer is currently unbound, presumably

		 * due to a hotplug event, that userspace has not
@@ -944,7 +954,14 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, 
	if (crtc->primary->old_fb)

		drm_framebuffer_put(crtc->primary->old_fb);

	crtc->primary->old_fb = NULL;

	drm_modeset_unlock_crtc(crtc);



	if (ret == -EDEADLK) {

		drm_modeset_backoff(&ctx);

		goto retry;

	}



	drm_modeset_drop_locks(&ctx);

	drm_modeset_acquire_fini(&ctx);



	return ret;

}