From bac91e9ab13fc2d442f4dba18dc973c6efb2a420 Mon Sep 17 00:00:00 2001 From: Avri Altman Date: Wed, 12 Mar 2025 22:51:00 +0900 Subject: [PATCH] mmc: core: Use GFP_NOIO in ACMD22 BugLink: https://bugs.launchpad.net/bugs/2102118 [ Upstream commit 869d37475788b0044bec1a33335e24abaf5e8884 ] 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@intel.com/ Suggested-by: Adrian Hunter Reviewed-by: Adrian Hunter Fixes: 051913dada04 ("mmc_block: do not DMA to stack") Signed-off-by: Avri Altman Cc: stable@vger.kernel.org Message-ID: <20241021153227.493970-1-avri.altman@wdc.com> Signed-off-by: Ulf Hansson Signed-off-by: Sasha Levin Signed-off-by: Koichiro Den Signed-off-by: Stefan Bader --- 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 021f3b446fa1..9dae4daeed9e 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -949,6 +949,8 @@ 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 = {}; @@ -972,7 +974,9 @@ 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;