linux-kernel - [PATCH next] drm/mediatek: Fix platform_get

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Message-ID: <aSW0p5sqnJVJsqDO@stanley.mountain>
Date: Tue, 25 Nov 2025 16:52:39 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Matthias Brugger <matthias.bgg@...il.com>,
	CK Hu <ck.hu@...iatek.com>,
	Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>,
	dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH next] drm/mediatek: Fix platform_get_irq() error checking

The platform_get_irq() function returns negative error codes on failure
and positive non-zero IRQ numbers on success.  It never returns NULL. Fix
the error checking to look for negatives, and change "hdmi->irq" from
unsigned int to just int.

Fixes: 8d0f79886273 ("drm/mediatek: Introduce HDMI/DDC v2 for MT8195/MT8188")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/gpu/drm/mediatek/mtk_hdmi_common.c | 2 +-
 drivers/gpu/drm/mediatek/mtk_hdmi_common.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
index e78eb0876f16..bd7f8c56ec9c 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
@@ -303,7 +303,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device
 		return dev_err_probe(dev, ret, "Failed to get clocks\n");
 
 	hdmi->irq = platform_get_irq(pdev, 0);
-	if (!hdmi->irq)
+	if (hdmi->irq < 0)
 		return hdmi->irq;
 
 	hdmi->regs = device_node_to_regmap(dev->of_node);
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.h b/drivers/gpu/drm/mediatek/mtk_hdmi_common.h
index de5e064585f8..7a644bbf5843 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.h
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.h
@@ -168,7 +168,7 @@ struct mtk_hdmi {
 	bool audio_enable;
 	bool powered;
 	bool enabled;
-	unsigned int irq;
+	int irq;
 	enum hdmi_hpd_state hpd;
 	hdmi_codec_plugged_cb plugged_cb;
 	struct device *codec_dev;
-- 
2.51.0