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

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Date:   Mon, 25 Apr 2022 09:18:31 +0000
From:   cgel.zte@...il.com
To:     sean@...rly.run, quic_abhinavk@...cinc.com
Cc:     robdclark@...il.com, airlied@...ux.ie, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, swboyd@...omium.org,
        angelogioacchino.delregno@...labora.com,
        daniel.thompson@...aro.org, linmq006@...il.com,
        christophe.jaillet@...adoo.fr, lv.ruyi@....com.cn,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] drm/msm/hdmi: 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: f6a8eaca0ea1 ("drm/msm/mdp5: use irqdomains")
Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 drivers/gpu/drm/msm/hdmi/hdmi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index ec324352e862..c3b661c2932d 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -298,9 +298,9 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
 	drm_connector_attach_encoder(hdmi->connector, hdmi->encoder);
 
 	hdmi->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
-	if (hdmi->irq < 0) {
-		ret = hdmi->irq;
-		DRM_DEV_ERROR(dev->dev, "failed to get irq: %d\n", ret);
+	if (!hdmi->irq) {
+		ret = -EINVAL;
+		DRM_DEV_ERROR(dev->dev, "failed to get irq\n");
 		goto fail;
 	}
 
-- 
2.25.1