mmc: sdio: Check the return value of sdio_enable_4bit_bus

Since we could move card->host->caps & MMC_CAP_4_BIT_DATA
ahead of mmc_sdio_init_uhs_card, in mmc_host_uhs(). So there
we could save this bit to check that. Also, if the process of
sdio_enable_4bit_bus goes wrong, we should bails out early.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index cc43687ca241..c599a628a387 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -518,11 +518,10 @@ static int mmc_sdio_init_uhs_card(struct mmc_card *card)
         if (!card->scr.sda_spec3)
                 return 0;
 
-        /*
-         * Switch to wider bus (if supported).
-         */
-        if (card->host->caps & MMC_CAP_4_BIT_DATA)
-                err = sdio_enable_4bit_bus(card);
+        /* Switch to wider bus */
+        err = sdio_enable_4bit_bus(card);
+        if (err)
+                goto out;
 
         /* Set the driver strength for the card */
         sdio_select_driver_type(card);