From afe4cb96153a0d8003e4e4ebd91b5c543e10df84 Mon Sep 17 00:00:00 2001
From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Date: Fri, 6 Jan 2023 10:30:11 +0800
Subject: [PATCH] drm/msm/hdmi: Add missing check for alloc_ordered_workqueue
Git-commit: afe4cb96153a0d8003e4e4ebd91b5c543e10df84
Patch-mainline: v6.3-rc1
References: git-fixes

Add check for the return value of alloc_ordered_workqueue as it may return
NULL pointer and cause NULL pointer dereference in `hdmi_hdcp.c` and
`hdmi_hpd.c`.

Fixes: c6a57a50ad56 ("drm/msm/hdmi: add hdmi hdcp support (V3)")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/517211/
Link: https://lore.kernel.org/r/20230106023011.3985-1-jiasheng@iscas.ac.cn
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/msm/hdmi/hdmi.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -248,6 +248,10 @@ static struct hdmi *msm_hdmi_init(struct
 	pm_runtime_enable(&pdev->dev);
 
 	hdmi->workq = alloc_ordered_workqueue("msm_hdmi", 0);
+	if (!hdmi->workq) {
+		ret = -ENOMEM;
+		goto fail;
+	}
 
 	hdmi->i2c = msm_hdmi_i2c_init(hdmi);
 	if (IS_ERR(hdmi->i2c)) {