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drm/mode: reduce lock hold in addfb2 

No need to hold the lock while assigning the variable.

Daniel wrote:
"Not sure why exactly I put that under the lock, but the only thing that
can race here is rmfb while addfb2 is still doing it's thing, with a
correctly guess (easy to do since they're fully deterministic) fb_id."

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2016-04-15 15:10:39 +10:00
parent 9cd47424fb
commit c7e1c59a18
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/drm_crtc.c
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@ -3445,11 +3445,11 @@ int drm_mode_addfb2(struct drm_device *dev,
if (IS_ERR(fb))
return PTR_ERR(fb);
/* Transfer ownership to the filp for reaping on close */
DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
mutex_lock(&file_priv->fbs_lock);
r->fb_id = fb->base.id;
/* Transfer ownership to the filp for reaping on close */
mutex_lock(&file_priv->fbs_lock);
list_add(&fb->filp_head, &file_priv->fbs);
mutex_unlock(&file_priv->fbs_lock);