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mmc: rtsx_pci: fix return value check of mmc_add_host()

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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 calling mmc_free_host() in the
error path, beside, runtime PM also needs be disabled.

Fixes: ff984e57d3 ("mmc: Add realtek pcie sdmmc host driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221101063023.1664968-6-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yang Yingliang 2022-11-01 14:30:19 +08:00 committed by Ulf Hansson
parent 80e1ef3afb
commit 0c87db7742
1 changed files with 8 additions and 1 deletions
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9
drivers/mmc/host/rtsx_pci_sdmmc.c
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@ -1474,6 +1474,7 @@ static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev)
struct realtek_pci_sdmmc *host;
struct rtsx_pcr *pcr;
struct pcr_handle *handle = pdev->dev.platform_data;
int ret;
if (!handle)
return -ENXIO;
@ -1511,7 +1512,13 @@ static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev)
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_use_autosuspend(&pdev->dev);
mmc_add_host(mmc);
ret = mmc_add_host(mmc);
if (ret) {
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
mmc_free_host(mmc);
return ret;
}
return 0;
}