From 34c1720a3830aec35d546e02af137836fc603f70 Mon Sep 17 00:00:00 2001 From: AngeloGioacchino Del Regno Date: Mon, 17 Feb 2025 16:48:10 +0100 Subject: [PATCH] drm/mediatek: mtk_hdmi: Unregister audio platform device on failure [ Upstream commit 0be123cafc06eed0fd1227166a66e786434b0c50 ] The probe function of this driver may fail after registering the audio platform device: in that case, the state is not getting cleaned up, leaving this device registered. Adding up to the mix, should the probe function of this driver return a probe deferral for N times, we're registering up to N audio platform devices and, again, never freeing them up. To fix this, add a pointer to the audio platform device in the mtk_hdmi structure, and add a devm action to unregister it upon driver removal or probe failure. Fixes: 8f83f26891e1 ("drm/mediatek: Add HDMI support") Reviewed-by: CK Hu Signed-off-by: AngeloGioacchino Del Regno Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20250217154836.108895-18-angelogioacchino.delregno@collabora.com/ Signed-off-by: Chun-Kuang Hu Signed-off-by: Sasha Levin --- drivers/gpu/drm/mediatek/mtk_hdmi.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c index 86133bf16326b..cff5ed3802413 100644 --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c @@ -173,6 +173,7 @@ struct mtk_hdmi { unsigned int sys_offset; void __iomem *regs; enum hdmi_colorspace csp; + struct platform_device *audio_pdev; struct hdmi_audio_param aud_param; bool audio_enable; bool powered; @@ -1666,6 +1667,11 @@ static const struct hdmi_codec_ops mtk_hdmi_audio_codec_ops = { .no_capture_mute = 1, }; +static void mtk_hdmi_unregister_audio_driver(void *data) +{ + platform_device_unregister(data); +} + static int mtk_hdmi_register_audio_driver(struct device *dev) { struct mtk_hdmi *hdmi = dev_get_drvdata(dev); @@ -1675,13 +1681,20 @@ static int mtk_hdmi_register_audio_driver(struct device *dev) .i2s = 1, .data = hdmi, }; - struct platform_device *pdev; + int ret; - pdev = platform_device_register_data(dev, HDMI_CODEC_DRV_NAME, - PLATFORM_DEVID_AUTO, &codec_data, - sizeof(codec_data)); - if (IS_ERR(pdev)) - return PTR_ERR(pdev); + hdmi->audio_pdev = platform_device_register_data(dev, + HDMI_CODEC_DRV_NAME, + PLATFORM_DEVID_AUTO, + &codec_data, + sizeof(codec_data)); + if (IS_ERR(hdmi->audio_pdev)) + return PTR_ERR(hdmi->audio_pdev); + + ret = devm_add_action_or_reset(dev, mtk_hdmi_unregister_audio_driver, + hdmi->audio_pdev); + if (ret) + return ret; DRM_INFO("%s driver bound to HDMI\n", HDMI_CODEC_DRV_NAME); return 0;