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mmc: read ext_csd version number

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Make sure we do not try to parse a structure we do not
understand.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2007-07-23 00:34:07 +02:00
parent adf66a0dc5
commit d7604d7635
2 changed files with 18 additions and 7 deletions
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24
drivers/mmc/core/mmc.c
View file

@ -161,6 +161,7 @@ static int mmc_read_ext_csd(struct mmc_card *card)
{
int err;
u8 *ext_csd;
unsigned int ext_csd_struct;
BUG_ON(!card);
@ -209,13 +210,22 @@ static int mmc_read_ext_csd(struct mmc_card *card)
goto out;
}
card->ext_csd.sectors =
ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
if (card->ext_csd.sectors)
mmc_card_set_blockaddr(card);
ext_csd_struct = ext_csd[EXT_CSD_REV];
if (ext_csd_struct > 2) {
printk("%s: unrecognised EXT_CSD structure version %d\n",
mmc_hostname(card->host), ext_csd_struct);
return -EINVAL;
}
if (ext_csd_struct >= 2) {
card->ext_csd.sectors =
ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
if (card->ext_csd.sectors)
mmc_card_set_blockaddr(card);
}
switch (ext_csd[EXT_CSD_CARD_TYPE]) {
case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:

1
include/linux/mmc/mmc.h
View file

@ -227,6 +227,7 @@ struct _mmc_csd {
#define EXT_CSD_BUS_WIDTH 183 /* R/W */
#define EXT_CSD_HS_TIMING 185 /* R/W */
#define EXT_CSD_CARD_TYPE 196 /* RO */
#define EXT_CSD_REV 192 /* RO */
#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
/*