On Fri, Sep 22, 2023 at 3:22 PM Imre Deak <imre.deak@xxxxxxxxx> wrote: > > On Fri, Sep 22, 2023 at 03:02:23PM -0400, Lyude Paul wrote: > > > > Oh! wow thank you for catching this: > > > > Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx> > > > > I will go and push this to drm-misc-next in just a moment > > > > On Fri, 2023-09-15 at 10:24 +0530, Ramya SR wrote: > > > Modeset mutex unlock is missing in drm_dp_mst_detect_port function. > > > This will lead to deadlock if calling the function multiple times in > > > an atomic operation, for example, getting imultiple MST ports status > > > for a DP MST bonding scenario. > > > > > > Signed-off-by: Ramya SR <quic_rsr@xxxxxxxxxxx> > > > --- > > > drivers/gpu/drm/display/drm_dp_mst_topology.c | 4 +++- > > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > > > diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c > > > index ed96cfc..d6512c4 100644 > > > --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c > > > +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c > > > @@ -4154,7 +4154,7 @@ drm_dp_mst_detect_port(struct drm_connector *connector, > > > > > > ret = drm_modeset_lock(&mgr->base.lock, ctx); > > > if (ret) > > > - goto out; > > > + goto fail; > > > > > > ret = connector_status_disconnected; > > > > > > @@ -4181,6 +4181,8 @@ drm_dp_mst_detect_port(struct drm_connector *connector, > > > break; > > > } > > > out: > > > + drm_modeset_unlock(&mgr->base.lock); > > Isn't this supposed to be unlocked only by drm_helper_probe_detect_ctx() > / drm_helper_probe_detect() ? Maybe adding a comment to that effect would be helpful for the future. Alex > > > > +fail: > > > drm_dp_mst_topology_put_port(port); > > > return ret; > > > } > > > > -- > > Cheers, > > Lyude Paul (she/her) > > Software Engineer at Red Hat > >
