From: Seunghui Lee Date: Mon, 22 Feb 2021 08:31:56 +0000 (+0900) Subject: mmc: core: Set read only for SD cards with permanent write protect bit X-Git-Tag: v4.4.269~174 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=458319b47133af9aaf86da0bb1a366846e61d913;p=thirdparty%2Fkernel%2Fstable.git mmc: core: Set read only for SD cards with permanent write protect bit commit 917a5336f2c27928be270226ab374ed0cbf3805d upstream. Some of SD cards sets permanent write protection bit in their CSD register, due to lifespan or internal problem. To avoid unnecessary I/O write operations, let's parse the bits in the CSD during initialization and mark the card as read only for this case. Signed-off-by: Seunghui Lee Link: https://lore.kernel.org/r/20210222083156.19158-1-sh043.lee@samsung.com Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index ed9af65e583ea..824a1bdec394a 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -138,6 +138,9 @@ static int mmc_decode_csd(struct mmc_card *card) csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; csd->erase_size <<= csd->write_blkbits - 9; } + + if (UNSTUFF_BITS(resp, 13, 1)) + mmc_card_set_readonly(card); break; case 1: /* @@ -172,6 +175,9 @@ static int mmc_decode_csd(struct mmc_card *card) csd->write_blkbits = 9; csd->write_partial = 0; csd->erase_size = 1; + + if (UNSTUFF_BITS(resp, 13, 1)) + mmc_card_set_readonly(card); break; default: pr_err("%s: unrecognised CSD structure version %d\n",