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drm: fb refcounting for dirtyfb_ioctl

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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 <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-12-11 00:38:18 +01:00
parent 58c0dca106
commit 4ccf097f19
1 changed files with 6 additions and 9 deletions
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15
drivers/gpu/drm/drm_crtc.c
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@ -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;
}