linux-kernel - [PATCH] drm/amdgpu/dm/mst: Fix incorrect usage of drm_dp_add_payload

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Date:   Tue,  4 Oct 2022 15:24:28 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Fangzhi Zuo <Jerry.Zuo@....com>, Wayne Lin <Wayne.Lin@....com>,
        Ian Chen <ian.chen@....com>,
        Mikita Lipski <mikita.lipski@....com>,
        Hamza Mahfooz <hamza.mahfooz@....com>,
        Claudio Suarez <cssk@...-c.es>,
        Colin Ian King <colin.i.king@...il.com>,
        Jani Nikula <jani.nikula@...el.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/amdgpu/dm/mst: Fix incorrect usage of drm_dp_add_payload_part2()

Yikes, it appears somehow I totally made a mistake here. We're currently
checking to see if drm_dp_add_payload_part2() returns a non-zero value to
indicate success. That's totally wrong though, as this function only
returns a zero value on success - not the other way around.

So, fix that.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Issue: https://gitlab.freedesktop.org/drm/amd/-/issues/2171
Fixes: 4d07b0bc4034 ("drm/display/dp_mst: Move all payload info into the atomic state")
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index b8077fcd4651..00598def5b39 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -297,7 +297,7 @@ bool dm_helpers_dp_mst_send_payload_allocation(
 		clr_flag = MST_ALLOCATE_NEW_PAYLOAD;
 	}
 
-	if (enable && drm_dp_add_payload_part2(mst_mgr, mst_state->base.state, payload)) {
+	if (enable && drm_dp_add_payload_part2(mst_mgr, mst_state->base.state, payload) == 0) {
 		amdgpu_dm_set_mst_status(&aconnector->mst_status,
 			set_flag, false);
 	} else {
-- 
2.37.3