This is a note to let you know that I've just added the patch titled
mmc: core: Set read only for SD cards with permanent write protect bit
to the 5.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-core-set-read-only-for-sd-cards-with-permanent-write-protect-bit.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 917a5336f2c27928be270226ab374ed0cbf3805d Mon Sep 17 00:00:00 2001
From: Seunghui Lee <sh043.lee@xxxxxxxxxxx>
Date: Mon, 22 Feb 2021 17:31:56 +0900
Subject: mmc: core: Set read only for SD cards with permanent write protect bit
From: Seunghui Lee <sh043.lee@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210222083156.19158-1-sh043.lee@xxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/sd.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -135,6 +135,9 @@ static int mmc_decode_csd(struct mmc_car
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_car
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",
Patches currently in stable-queue which might be from sh043.lee@xxxxxxxxxxx are
queue-5.12/mmc-core-set-read-only-for-sd-cards-with-permanent-write-protect-bit.patch
