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drm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference

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prev_sink is unconditionally retained via dc_sink_retain at function
  entry, but the DP alt mode timeout path inside SIGNAL_TYPE_DISPLAY_PORT
  returns false without releasing prev_sink. All other return paths in the
  function correctly call dc_sink_release(prev_sink), making this the only
  missing cleanup.

Fixes: 54618888d1 ("drm/amd/display: break down dc_link.c")
Signed-off-by: WenTao Liang <vulab@iscas.ac.cn>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Link: https://patch.msgid.link/20260626124555.36910-1-vulab@iscas.ac.cn
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 45510cf662)
Cc: stable@vger.kernel.org
This commit is contained in:
WenTao Liang
2026-06-26 20:45:55 +08:00
committed by Alex Deucher
parent 220f22e1d6
commit a6e14b976b
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/amd/display/dc/link/link_detection.c
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@@ -1164,8 +1164,11 @@ static bool detect_link_and_local_sink(struct dc_link *link,
link->link_enc->features.flags.bits.DP_IS_USB_C == 1) {
/* if alt mode times out, return false */
if (!wait_for_entering_dp_alt_mode(link))
if (!wait_for_entering_dp_alt_mode(link)) {
if (prev_sink)
dc_sink_release(prev_sink);
return false;
}
}
if (!detect_dp(link, &sink_caps, reason)) {