On Mon, Jun 22, 2015 at 02:40:44PM +1000, Dave Airlie wrote:
From: Dave Airlie airlied@redhat.com
If we are doing an MST transaction and we've gotten HPD and we lookup the device from the incoming msg, we should take the mgr lock around it, so that mst_primary and mstb->ports are valid.
Signed-off-by: Dave Airlie airlied@redhat.com
Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch
drivers/gpu/drm/drm_dp_mst_topology.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 3c7e5cd..15a6d8e 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1175,6 +1175,8 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_ struct drm_dp_mst_port *port; int i; /* find the port by iterating down */
mutex_lock(&mgr->lock); mstb = mgr->mst_primary;
for (i = 0; i < lct - 1; i++) {
@@ -1194,6 +1196,7 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_ } } kref_get(&mstb->kref);
- mutex_unlock(&mgr->lock); return mstb;
}
-- 2.4.1
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