linux-kernel - [PATCH] drm/amd/display: should check error using DC

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Message-Id: <20200816073214.980424-1-ztong0001@gmail.com>
Date:   Sun, 16 Aug 2020 03:32:12 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     harry.wentland@....com, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch, Rodrigo.Siqueira@....com,
        wenjing.liu@....com, Bhawanpreet.Lakha@....com,
        abdoulaye.berthe@....com, hersenxs.wu@....com,
        jinlong.zhang@....com, aric.cyr@....com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     ztong0001@...il.com
Subject: [PATCH] drm/amd/display: should check error using DC_OK

core_link_read_dpcd returns only DC_OK(1) and DC_ERROR_UNEXPECTED(-1),
the caller should check error using DC_OK instead of checking against 0

Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 5cb7b834e459..a60a457fcc8f 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -4376,9 +4376,9 @@ bool dc_link_get_backlight_level_nits(struct dc_link *link,
 			link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
 		return false;
 
-	if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_CURRENT_PEAK,
+	if (core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_CURRENT_PEAK,
 			dpcd_backlight_get.raw,
-			sizeof(union dpcd_source_backlight_get)))
+			sizeof(union dpcd_source_backlight_get)) != DC_OK)
 		return false;
 
 	*backlight_millinits_avg =
@@ -4417,9 +4417,9 @@ bool dc_link_read_default_bl_aux(struct dc_link *link, uint32_t *backlight_milli
 		link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
 		return false;
 
-	if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
+	if (core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
 		(uint8_t *) backlight_millinits,
-		sizeof(uint32_t)))
+		sizeof(uint32_t)) != DC_OK)
 		return false;
 
 	return true;
-- 
2.25.1