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mmc: core: Set read only for SD cards with permanent write protect bit

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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 <sh043.lee@samsung.com>
Link: https://lore.kernel.org/r/20210222083156.19158-1-sh043.lee@samsung.com
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Seunghui Lee 2021-02-22 17:31:56 +09:00 committed by Greg Kroah-Hartman
parent 57859c6354
commit c66b0d5e24
1 changed files with 6 additions and 0 deletions
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6
drivers/mmc/core/sd.c
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@ -136,6 +136,9 @@ 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:
/*
@ -170,6 +173,9 @@ 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",