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

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Message-Id: <20220424031959.3172406-1-lv.ruyi@zte.com.cn>
Date:   Sun, 24 Apr 2022 03:19:59 +0000
From:   cgel.zte@...il.com
To:     dmitry.baryshkov@...aro.org
Cc:     airlied@...ux.ie, angelogioacchino.delregno@...labora.com,
        cgel.zte@...il.com, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, lv.ruyi@....com.cn,
        quic_abhinavk@...cinc.com, quic_mkrishn@...cinc.com,
        sean@...rly.run, swboyd@...omium.org, vulab@...as.ac.cn,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH v2] drm: msm: 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.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
v2: don't print irq, and return ERR_PTR(-EINVAL)
---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 3b92372e7bdf..44e395e59df9 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -570,9 +570,9 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
 	}
 
 	irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
-	if (irq < 0) {
-		ret = irq;
-		DRM_DEV_ERROR(&pdev->dev, "failed to get irq: %d\n", ret);
+	if (!irq) {
+		ret = -EINVAL;
+		DRM_DEV_ERROR(&pdev->dev, "failed to get irq\n");
 		goto fail;
 	}
 
-- 
2.25.1