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| author | Seunghui Lee <sh043.lee@samsung.com> | 2021-02-22 17:31:56 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-11 14:04:03 +0200 |
| commit | c80524b9e418352395debcd9e0835bbde94323f3 (patch) | |
| tree | 77b436c80c267902e63b2284a8703c7e667083b8 /drivers/mmc | |
| parent | 42998c98ce9f974d7625d2cfa011691c430f2ad6 (diff) | |
| download | linux-c80524b9e418352395debcd9e0835bbde94323f3.tar.gz linux-c80524b9e418352395debcd9e0835bbde94323f3.tar.bz2 linux-c80524b9e418352395debcd9e0835bbde94323f3.zip | |
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 <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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/sd.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index fe914ff5f5d6..4f7c08e68f8c 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -135,6 +135,9 @@ 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: /* @@ -169,6 +172,9 @@ 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", |