[PATCHv3] mmc: rpmb: fixes pause retune on all RPMB partitions.

From: Jorge Ramirez-Ortiz
Date: Fri Dec 01 2023 - 05:05:39 EST


When RPMB was converted to a character device, it added support for
multiple RPMB partitions (Commit 97548575bef3 ("mmc: block: Convert RPMB
to a character device").

One of the changes in this commit was transforming the variable
target_part defined in __mmc_blk_ioctl_cmd into a bitmask.

This inadvertedly regressed the validation check done in
mmc_blk_part_switch_pre() and mmc_blk_part_switch_post().

This commit fixes that regression.

Fixes: 97548575bef3 ("mmc: block: Convert RPMB to a character device")
Signed-off-by: Jorge Ramirez-Ortiz <jorge@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.0+
---

v2:
fixes parenthesis around condition
v3:
adds stable to commit header

drivers/mmc/core/block.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 152dfe593c43..13093d26bf81 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -851,9 +851,10 @@ static const struct block_device_operations mmc_bdops = {
static int mmc_blk_part_switch_pre(struct mmc_card *card,
unsigned int part_type)
{
+ const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB;
int ret = 0;

- if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
+ if ((part_type & mask) == mask) {
if (card->ext_csd.cmdq_en) {
ret = mmc_cmdq_disable(card);
if (ret)
@@ -868,9 +869,10 @@ static int mmc_blk_part_switch_pre(struct mmc_card *card,
static int mmc_blk_part_switch_post(struct mmc_card *card,
unsigned int part_type)
{
+ const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB;
int ret = 0;

- if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
+ if ((part_type & mask) == mask) {
mmc_retune_unpause(card->host);
if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
ret = mmc_cmdq_enable(card);
@@ -3143,4 +3145,3 @@ module_exit(mmc_blk_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
-
--
2.34.1