[U-Boot] [PATCH v4 05/10] mmc: fix for old MMCs (below version 4)

The ext_csd is allocated only for MMC above version 4. The compare will crash or fail for older MMCs.

Signed-off-by: Jean-Jacques Hiblot jjhiblot@ti.com --- drivers/mmc/mmc.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 0ebcc45..2a58031 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1657,6 +1657,9 @@ static int mmc_read_and_compare_ext_csd(struct mmc *mmc) const u8 *ext_csd = mmc->ext_csd; ALLOC_CACHE_ALIGN_BUFFER(u8, test_csd, MMC_MAX_BLOCK_LEN);

+ if (mmc->version < MMC_VERSION_4) + return 0; + err = mmc_send_ext_csd(mmc, test_csd); if (err) return err;