On Mon, 21 Oct 2024 at 17:34, Avri Altman <avri.altman@xxxxxxx> wrote: > > While reviewing the SDUC series, Adrian made a comment concerning the > memory allocation code in mmc_sd_num_wr_blocks() - see [1]. > Prevent memory allocations from triggering I/O operations while ACMD22 > is in progress. > > [1] https://lore.kernel.org/linux-mmc/3016fd71-885b-4ef9-97ed-46b4b0cb0e35@xxxxxxxxx/ > > Suggested-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> > Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> > Fixes: 051913dada04 ("mmc_block: do not DMA to stack") > Signed-off-by: Avri Altman <avri.altman@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx Applied for next (as it doesn't apply on fixes), thanks! Kind regards Uffe > > --- > Changes since v2: > - Fix checkpatch warnings (Adrian) > > Changes since v1: > - Move memalloc_noio_restore around (Adrian) > --- > drivers/mmc/core/block.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c > index 04f3165cf9ae..a813fd7f39cc 100644 > --- a/drivers/mmc/core/block.c > +++ b/drivers/mmc/core/block.c > @@ -995,6 +995,8 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) > u32 result; > __be32 *blocks; > u8 resp_sz = mmc_card_ult_capacity(card) ? 8 : 4; > + unsigned int noio_flag; > + > struct mmc_request mrq = {}; > struct mmc_command cmd = {}; > struct mmc_data data = {}; > @@ -1018,7 +1020,9 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) > mrq.cmd = &cmd; > mrq.data = &data; > > + noio_flag = memalloc_noio_save(); > blocks = kmalloc(resp_sz, GFP_KERNEL); > + memalloc_noio_restore(noio_flag); > if (!blocks) > return -ENOMEM; > > -- > 2.25.1 >
