linux-kernel - [PATCH 5.15 272/667] drm/msm/hdmi: fix error check return value of irq_of_parse_and

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Message-Id: <20220607164942.943335089@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 18:58:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zeal Robot <zealci@....com.cn>,
        Lv Ruyi <lv.ruyi@....com.cn>,
        Stephen Boyd <swboyd@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 272/667] drm/msm/hdmi: fix error check return value of irq_of_parse_and_map()

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

[ Upstream commit 03371e4fbdeb7f596cbceacb59e474248b6d95ac ]

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>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Patchwork: https://patchwork.freedesktop.org/patch/483294/
Link: https://lore.kernel.org/r/20220425091831.3500487-1-lv.ruyi@zte.com.cn
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 c3d95e7af1e4..23fb88b53324 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -319,9 +319,9 @@ 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;
 	}
 
-- 
2.35.1