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.
---
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 f545576..8f6cbd5 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
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