[U-Boot] [PATCH v3 13/18] mmc: the ext_csd data may be used during init even if reading failed

[Diego Santa Cruz]

The mmc_startup() function uses the ext_csd data even if reading it
from the mmc device failed. This bug was introduced in commit
bc897b1d4d86597311430dbe7b3e6c807c8c53e5. We now bail out if
reading it fails, this should not be a problem as ext_csd was
introduced in MMC 4.0 and this code is conditional on MMC >= 4.0.

Signed-off-by: Diego Santa Cruz <Diego.SantaCruz at spinetix.com>
---
 drivers/mmc/mmc.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index dc8f830..d208118 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -972,7 +972,9 @@ static int mmc_startup(struct mmc *mmc)
 	if (!IS_SD(mmc) && (mmc->version >= MMC_VERSION_4)) {
 		/* check  ext_csd version and capacity */
 		err = mmc_send_ext_csd(mmc, ext_csd);
-		if (!err && (ext_csd[EXT_CSD_REV] >= 2)) {
+		if (err)
+			return err;
+		if (ext_csd[EXT_CSD_REV] >= 2) {
 			/*
 			 * According to the JEDEC Standard, the value of
 			 * ext_csd's capacity is valid if the value is more
-- 
1.7.1