mmc: core: Fix bit width test failing on old eMMC cards

PARTITION_SUPPORT needs to be set before doing the compare on version
number so the bit width test does not get invalid data.  Before this
patch, a Sandisk iNAND eMMC card would detect 1-bit width although
the hardware supports 4-bit.

Only affects old emmc devices - pre 4.4 devices.

Reported-by: Elad Yi <elad.yi@gmail.com>
Signed-off-by: Philip Rakity <prakity@yahoo.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index d584f7ca168c606e88f7b979d3cc70c0bb1a9a53..0cbd1effe9605b90f8f3696b41933e39c1a06cf6 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -369,13 +369,13 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
                ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
        card->ext_csd.raw_trim_mult =
                ext_csd[EXT_CSD_TRIM_MULT];
+       card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
        if (card->ext_csd.rev >= 4) {
                /*
                 * Enhanced area feature support -- check whether the eMMC
                 * card has the Enhanced area enabled.  If so, export enhanced
                 * area offset and size to user by adding sysfs interface.
                 */
-               card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
                if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
                    (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
                        hc_erase_grp_sz =