From 1de06b9fa5871b75012307ea736c8a43edf5a888 Mon Sep 17 00:00:00 2001 From: Jean-Jacques Hiblot Date: Thu, 30 Nov 2017 17:43:58 +0100 Subject: [PATCH] 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 --- 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; -- 2.7.4