@@ -307,6 +307,9 @@ static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
unsigned max_blocks;
int ret;
+ if ((!func->card) || (func->num > 7))
+ return -EINVAL;
+
/* Do the bulk of the transfer using block mode (if supported). */
if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) {
/* Blocks per command is limited by host count, host transfer
@@ -129,8 +129,6 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
unsigned int nents, left_size, i;
unsigned int seg_size = card->host->max_seg_size;
- BUG_ON(!card);
- BUG_ON(fn > 7);
WARN_ON(blksz == 0);
/* sanity check */
When using mmc_io_rw_extended, it's intent to avoid null pointer of card and invalid func number. But actually it didn't prevent that as the seg_size already use the card. Currently the wrapper function sdio_io_rw_ext_helper already use card before calling mmc_io_rw_extended, so we should move this check to there. As to the func number, it was token from '(ocr & 0x70000000) >> 28' which should be enough to guarantee that it won't be larger than 7. But we should prevent the caller like wifi drivers modify this value. So let's move this check into sdio_io_rw_ext_helper either. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> --- Changes in v2: - remove the BUG_ON and move these into sdio_io_rw_ext_helper drivers/mmc/core/sdio_io.c | 3 +++ drivers/mmc/core/sdio_ops.c | 2 -- 2 files changed, 3 insertions(+), 2 deletions(-)