We only need to ensure that the fb stays around for long enough. While at it, only grab the modeset locks when we need them (since most drivers don't implement the dirty callback, this should help jitter and stalls when using the generic modeset driver).
Signed-off-by: Daniel Vetter daniel.vetter@ffwll.ch --- drivers/gpu/drm/drm_crtc.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 8003063..ed0108e 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -2580,14 +2580,9 @@ int drm_mode_dirtyfb_ioctl(struct drm_device *dev, if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EINVAL;
- drm_modeset_lock_all(dev); fb = drm_framebuffer_lookup(dev, r->fb_id); - if (!fb) { - ret = -EINVAL; - goto out_err1; - } - /* fb is protect by the mode_config lock, so drop the ref immediately */ - drm_framebuffer_unreference(fb); + if (!fb) + return -EINVAL;
num_clips = r->num_clips; clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr; @@ -2625,17 +2620,19 @@ int drm_mode_dirtyfb_ioctl(struct drm_device *dev, }
if (fb->funcs->dirty) { + drm_modeset_lock_all(dev); ret = fb->funcs->dirty(fb, file_priv, flags, r->color, clips, num_clips); + drm_modeset_unlock_all(dev); } else { ret = -ENOSYS; - goto out_err2; }
out_err2: kfree(clips); out_err1: - drm_modeset_unlock_all(dev); + drm_framebuffer_unreference(fb); + return ret; }