4.1-stable review patch. If anyone has any objections, please let me know.
------------------ From: Dave Airlie <[email protected]> commit 9eb1e57f564d4e6e10991402726cc83fe0b9172f upstream. 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. Reviewed-by: Daniel Vetter <[email protected]> Signed-off-by: Dave Airlie <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/gpu/drm/drm_dp_mst_topology.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1171,6 +1171,8 @@ static struct drm_dp_mst_branch *drm_dp_ 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++) { @@ -1190,6 +1192,7 @@ static struct drm_dp_mst_branch *drm_dp_ } } kref_get(&mstb->kref); + mutex_unlock(&mgr->lock); return mstb; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
