linux-kernel - Re: [PATCH] mmc: rpmb: fixes pause retune on all RPMB partitions.

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Message-ID: <ZWmptatt60if9GBH@trax>
Date:   Fri, 1 Dec 2023 10:39:01 +0100
From:   "Jorge Ramirez-Ortiz, Foundries" <jorge@...ndries.io>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Jorge Ramirez-Ortiz <jorge@...ndries.io>, ulf.hansson@...aro.org,
        CLoehle@...erstone.com, adrian.hunter@...el.com,
        jinpu.wang@...os.com, hare@...e.de, beanhuo@...ron.com,
        asuk4.q@...il.com, yangyingliang@...wei.com, yibin.ding@...soc.com,
        victor.shih@...esyslogic.com.tw, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: rpmb: fixes pause retune on all RPMB partitions.

On 01/12/23 10:28:52, Linus Walleij wrote:
> Hi Jorge,
>
> thanks for your patch!
>
> On Fri, Dec 1, 2023 at 10:10 AM Jorge Ramirez-Ortiz <jorge@...ndries.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@...ndries.io>
>
> My bug :/
> Shouldn't we also add Cc: stable@...r.kernel.org?

ack, will do.

>
>
> > +       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) {
>
> That looks complex, can't we just:
>
> if (part_type & EXT_CSD_PART_CONFIG_ACC_RPMB)?

I chose to mention the mask nature of the field for clarity - just in
case - but I'd much rather do your suggestion. So will do :)

>
> > +       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) {
>
> Dito here.

yep

>
> Yours,
> Linus Walleij

thanks !