This is a note to let you know that I've just added the patch titled
mmc: core: Capture correct oemid-bits for eMMC cards
to the 4.19-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-capture-correct-oemid-bits-for-emmc-cards.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 84ee19bffc9306128cd0f1c650e89767079efeff Mon Sep 17 00:00:00 2001
From: Avri Altman <avri.altman@xxxxxxx>
Date: Wed, 27 Sep 2023 10:15:00 +0300
Subject: mmc: core: Capture correct oemid-bits for eMMC cards
From: Avri Altman <avri.altman@xxxxxxx>
commit 84ee19bffc9306128cd0f1c650e89767079efeff upstream.
The OEMID is an 8-bit binary number rather than 16-bit as the current code
parses for. The OEMID occupies bits [111:104] in the CID register, see the
eMMC spec JESD84-B51 paragraph 7.2.3. It seems that the 16-bit comes from
the legacy MMC specs (v3.31 and before).
Let's fix the parsing by simply move to use 8-bit instead of 16-bit. This
means we ignore the impact on some of those old MMC cards that may be out
there, but on the other hand this shouldn't be a problem as the OEMID seems
not be an important feature for these cards.
Signed-off-by: Avri Altman <avri.altman@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230927071500.1791882-1-avri.altman@xxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -98,7 +98,7 @@ static int mmc_decode_cid(struct mmc_car
case 3: /* MMC v3.1 - v3.3 */
case 4: /* MMC v4 */
card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
- card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
+ card->cid.oemid = UNSTUFF_BITS(resp, 104, 8);
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
Patches currently in stable-queue which might be from avri.altman@xxxxxxx are
queue-4.19/mmc-core-capture-correct-oemid-bits-for-emmc-cards.patch
