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

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Date:   Mon, 25 Apr 2022 09:14:02 +0000
From:   cgel.zte@...il.com
To:     benh@...nel.crashing.org, joel@....id.au
Cc:     brendanhiggins@...gle.com, tglx@...utronix.de, maz@...nel.org,
        andrew@...id.au, linux-i2c@...r.kernel.org,
        openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, Lv Ruyi <lv.ruyi@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] drm/msm/dsi: 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 a negative value anyhow, so never enter this conditional branch.

Fixes: bf94ec093d0 ("drm/msm/dsi: do not enable irq handler before powering up the host")
Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index d51e70fab93d..29199e6e15ee 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1873,10 +1873,9 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 	}
 
 	msm_host->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
-	if (msm_host->irq < 0) {
-		ret = msm_host->irq;
-		dev_err(&pdev->dev, "failed to get irq: %d\n", ret);
-		return ret;
+	if (!msm_host->irq) {
+		dev_err(&pdev->dev, "failed to get irq\n");
+		return -EINVAL;
 	}
 
 	/* do not autoenable, will be enabled later */
-- 
2.25.1