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| author | Balaji T K <balajitk@ti.com> | 2013-01-25 17:00:30 +0530 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-02-24 14:37:05 -0500 |
| commit | d0123ccac55088811bde4f76c4a3fdbd39c3cfba (patch) | |
| tree | 00b6a7c84b7f47fbfbc0c1578c1b428cb4418a51 /drivers/mmc | |
| parent | 85c34d2e7b0e0425cd3efc243ffc4e3631daa0b5 (diff) | |
| download | linux-d0123ccac55088811bde4f76c4a3fdbd39c3cfba.tar.gz linux-d0123ccac55088811bde4f76c4a3fdbd39c3cfba.tar.bz2 linux-d0123ccac55088811bde4f76c4a3fdbd39c3cfba.zip | |
mmc: core: expose RPMB partition only for CMD23 capable hosts
SET_BLOCK_COUNT CMD23 is needed for all access to RPMB partition. If
block count is not set by CMD23, all subsequent read/write commands fail
as per eMMC specification. So, If the host does not support CMD23, do not
expose RPMB partition.
Accessing RPMB partition can cause hang / huge delay for hosts which do
not support CMD23.
Signed-off-by: Balaji T K <balajitk@ti.com>
Reported-and-Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index dc17d4097f9a..0d7a9795a6da 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -496,7 +496,7 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) * RPMB regions are defined in multiples of 128K. */ card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT]; - if (ext_csd[EXT_CSD_RPMB_MULT]) { + if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) { mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17, EXT_CSD_PART_CONFIG_ACC_RPMB, "rpmb", 0, false, |