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mmc: core: expose RPMB partition only for CMD23 capable hosts

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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 <[email protected]>
Reported-and-Tested-by: Peter Ujfalusi <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Balaji T K 2013-01-25 17:00:30 +05:30 • committed by Chris Ball
commit d0123ccac5
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/core/mmc.c
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@ -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,