linux-kernel - [PATCH AUTOSEL 6.1 09/12] drm: use mgr->dev in drm_dbg_kms in drm_dp_add_payload

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Message-Id: <20230629190134.907949-9-sashal@kernel.org>
Date:   Thu, 29 Jun 2023 15:01:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jeff Layton <jlayton@...nel.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Lyude Paul <lyude@...hat.com>, Sasha Levin <sashal@...nel.org>,
        airlied@...il.com, daniel@...ll.ch, imre.deak@...el.com,
        Wayne.Lin@....com, alexander.deucher@....com,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.1 09/12] drm: use mgr->dev in drm_dbg_kms in drm_dp_add_payload_part2

From: Jeff Layton <jlayton@...nel.org>

[ Upstream commit 54d217406afe250d7a768783baaa79a035f21d38 ]

I've been experiencing some intermittent crashes down in the display
driver code. The symptoms are ususally a line like this in dmesg:

    amdgpu 0000:30:00.0: [drm] Failed to create MST payload for port 000000006d3a3885: -5

...followed by an Oops due to a NULL pointer dereference.

Switch to using mgr->dev instead of state->dev since "state" can be
NULL in some cases.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=2184855
Suggested-by: Jani Nikula <jani.nikula@...ux.intel.com>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Reviewed-by: Jani Nikula <jani.nikula@...el.com>
Reviewed-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Lyude Paul <lyude@...hat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230419112447.18471-1-jlayton@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/display/drm_dp_mst_topology.c | 2 +-
 1 file changed, 1 insertion(+), 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 38dab76ae69ea..e2e21ce79510e 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -3404,7 +3404,7 @@ int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
 
 	/* Skip failed payloads */
 	if (payload->vc_start_slot == -1) {
-		drm_dbg_kms(state->dev, "Part 1 of payload creation for %s failed, skipping part 2\n",
+		drm_dbg_kms(mgr->dev, "Part 1 of payload creation for %s failed, skipping part 2\n",
 			    payload->port->connector->name);
 		return -EIO;
 	}
-- 
2.39.2