linux-kernel - [PATCH v2] drm/msm/dp: fix error check return value of irq_of_parse_and

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Message-Id: <20220424032418.3173632-1-lv.ruyi@zte.com.cn>
Date:   Sun, 24 Apr 2022 03:24:18 +0000
From:   cgel.zte@...il.com
To:     dmitry.baryshkov@...aro.org
Cc:     airlied@...ux.ie, bjorn.andersson@...aro.org, cgel.zte@...il.com,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux@...ck-us.net, lv.ruyi@....com.cn, quic_abhinavk@...cinc.com,
        quic_khsieh@...cinc.com, robdclark@...il.com, sean@...rly.run,
        swboyd@...omium.org, Zeal Robot <zealci@....com.cn>
Subject: [PATCH v2] drm/msm/dp: fix error check return value of irq_of_parse_and_map()

From: Lv Ruyi <lv.ruyi@....com.cn>

The irq_of_parse_and_map() function returns 0 on failure, and does not
return an negative value.

Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
v2: don't print rc, and return -EINVAL rather than 0
---
 drivers/gpu/drm/msm/dp/dp_display.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index a42732b67349..c3566e6564b1 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1239,10 +1239,9 @@ int dp_display_request_irq(struct msm_dp *dp_display)
 	dp = container_of(dp_display, struct dp_display_private, dp_display);
 
 	dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
-	if (dp->irq < 0) {
-		rc = dp->irq;
-		DRM_ERROR("failed to get irq: %d\n", rc);
-		return rc;
+	if (!dp->irq) {
+		DRM_ERROR("failed to get irq\n");
+		return -EINVAL;
 	}
 
 	rc = devm_request_irq(&dp->pdev->dev, dp->irq,
-- 
2.25.1