[PATCH next] drm/mediatek: Fix platform_get_irq() error checking

[PATCH next] drm/mediatek: Fix platform_get_irq() error checking

[Dan Carpenter]

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@linaro.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

Re: [PATCH next] drm/mediatek: Fix platform_get_irq() error checking

[Chun-Kuang Hu]

Hi, Dan:

Dan Carpenter <dan.carpenter@linaro.org> 於 2025年11月25日週二 下午1:52寫道：
>
> 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.

Applied to mediatek-drm-fixes [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-fixes

Regards,
Chun-Kuang.

>
> Fixes: 8d0f79886273 ("drm/mediatek: Introduce HDMI/DDC v2 for MT8195/MT8188")
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.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
>