linux-kernel - [PATCH AUTOSEL 6.6 20/23] drm/dp_mst: Reset message rx state after OOM in drm_dp_mst_handle_up

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Message-ID: <20241211185214.3841978-20-sashal@kernel.org>
Date: Wed, 11 Dec 2024 13:51:57 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Imre Deak <imre.deak@...el.com>,
	Lyude Paul <lyude@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	jani.nikula@...el.com,
	alexander.deucher@....com,
	harry.wentland@....com,
	Wayne.Lin@....com,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 20/23] drm/dp_mst: Reset message rx state after OOM in drm_dp_mst_handle_up_req()

From: Imre Deak <imre.deak@...el.com>

[ Upstream commit 2b245c97b1af5d8f04c359e0826cb5a5c81ef704 ]

After an out-of-memory error the reception state should be reset, so
that the next attempt receiving a message doesn't fail (due to getting a
start-of-message packet, while the reception state has already the
start-of-message flag set).

Cc: Lyude Paul <lyude@...hat.com>
Reviewed-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Imre Deak <imre.deak@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241203160223.2926014-7-imre.deak@intel.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/display/drm_dp_mst_topology.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index 4d954e50964f0..b3c613f5e2089 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -3996,6 +3996,7 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
 {
 	struct drm_dp_pending_up_req *up_req;
 	struct drm_dp_mst_branch *mst_primary;
+	int ret = 0;
 
 	if (!drm_dp_get_one_sb_msg(mgr, true, NULL))
 		goto out_clear_reply;
@@ -4004,8 +4005,10 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
 		return 0;
 
 	up_req = kzalloc(sizeof(*up_req), GFP_KERNEL);
-	if (!up_req)
-		return -ENOMEM;
+	if (!up_req) {
+		ret = -ENOMEM;
+		goto out_clear_reply;
+	}
 
 	INIT_LIST_HEAD(&up_req->next);
 
@@ -4072,7 +4075,7 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
 	drm_dp_mst_topology_put_mstb(mst_primary);
 out_clear_reply:
 	memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
-	return 0;
+	return ret;
 }
 
 /**
-- 
2.43.0