linux-kernel - [PATCH 5.19 0546/1157] drm/amd/display: fix signedness bug in execute_synaptics_rc

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Message-Id: <20220815180501.496657347@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:58:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0546/1157] drm/amd/display: fix signedness bug in execute_synaptics_rc_command()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 06ac561fb0edf868f7b292fb4a3c8ffbbb1e14bb ]

The "ret" variable needs to be signed for the error handling to work.

Fixes: 2ca97adccdc9 ("drm/amd/display: Add Synaptics Fifo Reset Workaround")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 7c799ddc1d27..82c04af09d18 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
@@ -571,7 +571,7 @@ static bool execute_synaptics_rc_command(struct drm_dp_aux *aux,
 	unsigned char rc_cmd = 0;
 	unsigned char rc_result = 0xFF;
 	unsigned char i = 0;
-	uint8_t ret = 0;
+	int ret;
 
 	if (is_write_cmd) {
 		// write rc data
-- 
2.35.1