5.15-stable review patch. If anyone has any objections, please let me know.
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From: Wayne Lin Wayne.Lin@amd.com
[ Upstream commit d63d81094d208abb20fc444514b2d9ec2f4b7c4e ]
[Why] After supend/resume, with topology unchanged, observe that link_address_sent of all mstb are marked as false even the topology probing is done without any error.
It is caused by wrongly also include "ret == 0" case as a probing failure case.
[How] Remove inappropriate checking conditions.
Cc: Lyude Paul lyude@redhat.com Cc: Harry Wentland hwentlan@amd.com Cc: Jani Nikula jani.nikula@intel.com Cc: Imre Deak imre.deak@intel.com Cc: Daniel Vetter daniel@ffwll.ch Cc: stable@vger.kernel.org Fixes: 37dfdc55ffeb ("drm/dp_mst: Cleanup drm_dp_send_link_address() a bit") Signed-off-by: Wayne Lin Wayne.Lin@amd.com Reviewed-by: Lyude Paul lyude@redhat.com Signed-off-by: Lyude Paul lyude@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20240626084825.878565-2-Wayne.... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_dp_mst_topology.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 865c7f39143ec..f24667a003a2b 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2974,7 +2974,7 @@ static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
/* FIXME: Actually do some real error handling here */ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); - if (ret <= 0) { + if (ret < 0) { drm_err(mgr->dev, "Sending link address failed with %d\n", ret); goto out; } @@ -3026,7 +3026,7 @@ static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, mutex_unlock(&mgr->lock);
out: - if (ret <= 0) + if (ret < 0) mstb->link_address_sent = false; kfree(txmsg); return ret < 0 ? ret : changed;