[PATCHv4] mmc: rpmb: fixes pause retune on all RPMB partitions.

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@foundries.io>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: <stable@vger.kernel.org> # v4.14+
---

  v2:
     fixes parenthesis around condition
  v3:
     adds stable to commit header
  v4:
     fixes the stable version to v4.14
     adds Reviewed-by

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

--
2.34.1

On Fri, 1 Dec 2023 at 16:31, Jorge Ramirez-Ortiz <jorge@foundries.io> wrote:
>
> 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@foundries.io>
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Cc: <stable@vger.kernel.org> # v4.14+

Applied for fixes, thanks!

Kind regards
Uffe


> ---
>
>   v2:
>      fixes parenthesis around condition
>   v3:
>      adds stable to commit header
>   v4:
>      fixes the stable version to v4.14
>      adds Reviewed-by
>
>  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