From 4ccf097f1935321f03ad36218588a9e446006b6a Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Tue, 11 Dec 2012 00:38:18 +0100 Subject: [PATCH] drm: fb refcounting for dirtyfb_ioctl 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). Reviewed-by: Rob Clark Signed-off-by: Daniel Vetter --- 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 cba8c8b..d4f8fa5 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; } -- 2.7.4