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mmc: fix for old MMCs (below version 4)

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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>
This commit is contained in:
Jean-Jacques Hiblot 2017-11-30 17:43:58 +01:00 committed by Jaehoon Chung
parent 1da8eb598f
commit 1de06b9fa5
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/mmc.c
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@ -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;