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>

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,