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drm: Avoid connector reference imbalance on error path

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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@chris-wilson.co.uk>
Cc: Daniel Stone <daniels@collabora.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1462535265-13058-1-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-05-06 12:47:45 +01:00 committed by Daniel Vetter
parent 255f0e7c41
commit e2d800a3ce
1 changed files with 11 additions and 9 deletions
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20
drivers/gpu/drm/drm_atomic.c
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@ -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;
}