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

mmc_add_host() may return error, if we ignore its return value,
it will lead two issues:
1. The memory that allocated in mmc_alloc_host() is leaked.
2. In the remove() path, mmc_remove_host() will be called to
   delete device, but it's not added yet, it will lead a kernel
   crash because of null-ptr-deref in device_del().

Fix this by checking the return value and goto error path wihch
will call mmc_free_host().

Fixes: a45c6cb81647 ("[ARM] 5369/1: omap mmc: Add new omap hsmmc controller for 2430 and 34xx, v3")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221108121316.340354-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index fca30ad..4bd7447 100644 (file)
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1946,7 +1946,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
        if (!ret)
                mmc->caps |= MMC_CAP_SDIO_IRQ;
 
-       mmc_add_host(mmc);
+       ret = mmc_add_host(mmc);
+       if (ret)
+               goto err_irq;
 
        if (mmc_pdata(host)->name != NULL) {
                ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);