On Fri, May 06, 2016 at 12:47:45PM +0100, Chris Wilson wrote:
> Whilst looking at the fallout from using connector references for
> atomic, I noticed that there is an early return buried in
> drm_atomic_set_crtc_for_connector() that if hit could cause us to leak a
> reference on the connector.
>
> Fixes: d2307dea14 (drm/atomic: use connector references (v3))
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Daniel Stone <daniels@xxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
Applied to drm-misc, thanks.
-Daniel
> ---
> drivers/gpu/drm/drm_atomic.c | 20 +++++++++++---------
> 1 file changed, 11 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 86e89db02ed7..3ff1ed7b33db 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1160,14 +1160,18 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
> {
> struct drm_crtc_state *crtc_state;
>
> - if (crtc)
> - drm_connector_reference(conn_state->connector);
> - if (conn_state->crtc && conn_state->crtc != crtc) {
> + if (conn_state->crtc == crtc)
> + return 0;
> +
> + if (conn_state->crtc) {
> crtc_state = drm_atomic_get_existing_crtc_state(conn_state->state,
> conn_state->crtc);
>
> crtc_state->connector_mask &=
> ~(1 << drm_connector_index(conn_state->connector));
> +
> + drm_connector_unreference(conn_state->connector);
> + conn_state->crtc = NULL;
> }
>
> if (crtc) {
> @@ -1177,18 +1181,16 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
>
> crtc_state->connector_mask |=
> 1 << drm_connector_index(conn_state->connector);
> - }
>
> - if (conn_state->crtc)
> - drm_connector_unreference(conn_state->connector);
> - conn_state->crtc = crtc;
> + drm_connector_reference(conn_state->connector);
> + conn_state->crtc = crtc;
>
> - if (crtc)
> DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d:%s]\n",
> conn_state, crtc->base.id, crtc->name);
> - else
> + } else {
> DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
> conn_state);
> + }
>
> return 0;
> }
> --
> 2.8.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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