From 29276d56f6ed138db0f38cd31aedc0b725c8c76c Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Tue, 1 Nov 2022 14:30:23 +0800
Subject: [PATCH] mmc: wmt-sdmmc: fix return value check of mmc_add_host()
Git-commit: 29276d56f6ed138db0f38cd31aedc0b725c8c76c
Patch-mainline: v6.2-rc1
References: git-fixes
mmc_add_host() may return error, if we ignore its return value, the memory
that allocated in mmc_alloc_host() will be leaked and it will lead a kernel
crash because of deleting not added device in the remove path.
So fix this by checking the return value and goto error path which will call
mmc_free_host(), besides, clk_disable_unprepare() also needs be called.
Fixes: 3a96dff0f828 ("mmc: SD/MMC Host Controller for Wondermedia WM8505/WM8650")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221101063023.1664968-10-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/mmc/host/wmt-sdmmc.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c
index 9b5c503e3a3f..9aa3027ca25e 100644
--- a/drivers/mmc/host/wmt-sdmmc.c
+++ b/drivers/mmc/host/wmt-sdmmc.c
@@ -856,11 +856,15 @@ static int wmt_mci_probe(struct platform_device *pdev)
/* configure the controller to a known 'ready' state */
wmt_reset_hardware(mmc);
- mmc_add_host(mmc);
+ ret = mmc_add_host(mmc);
+ if (ret)
+ goto fail7;
dev_info(&pdev->dev, "WMT SDHC Controller initialized\n");
return 0;
+fail7:
+ clk_disable_unprepare(priv->clk_sdmmc);
fail6:
clk_put(priv->clk_sdmmc);
fail5_and_a_half:
--
2.35.3