mmc: core: Fix bit width test failing on old eMMC cards (836dc2fe) · Commits · 戴 / test

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>

drivers/mmc/core/mmc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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 =

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