linux-kernel - Re: [PATCH v5 08/14] soc: mediatek: Refactor bus protection control

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANMq1KDkzWk-CSib7NBtc-2zqmoW31vFrO5sOj1up-vFvnmhjQ@mail.gmail.com>
Date:   Tue, 19 Mar 2019 20:09:14 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Weiyi Lu <weiyi.lu@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh@...nel.org>,
        James Liao <jamesjj.liao@...iatek.com>,
        Fan Chen <fan.chen@...iatek.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v5 08/14] soc: mediatek: Refactor bus protection control

On Tue, Mar 19, 2019 at 4:02 PM Weiyi Lu <weiyi.lu@...iatek.com> wrote:
>
> Put bus protection enable and disable control in separate functions.
>
> Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-scpsys.c | 48 ++++++++++++++++++++++---------
>  1 file changed, 34 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> index 65b734b40098..6bf846cb1893 100644
> --- a/drivers/soc/mediatek/mtk-scpsys.c
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -279,6 +279,34 @@ static int scpsys_sram_disable(struct scp_domain *scpd, void __iomem *ctl_addr)
>                         MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
>  }
>
> +static int scpsys_bus_protect_enable(struct scp_domain *scpd)
> +{
> +       struct scp *scp = scpd->scp;
> +       int ret = 0;
> +
> +       if (scpd->data->bus_prot_mask) {
> +               ret = mtk_infracfg_set_bus_protection(scp->infracfg,
> +                               scpd->data->bus_prot_mask,
> +                               scp->bus_prot_reg_update);
> +       }
> +
> +       return ret;

Maybe other people have different opinions, but I prefer:

if (!scpd->data->bus_prot_mask)
    return 0;

return mtk_infracfg_set_bus_protection(...);

> +}
> +
> +static int scpsys_bus_protect_disable(struct scp_domain *scpd)
> +{
> +       struct scp *scp = scpd->scp;
> +       int ret = 0;
> +
> +       if (scpd->data->bus_prot_mask) {
> +               ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
> +                               scpd->data->bus_prot_mask,
> +                               scp->bus_prot_reg_update);
> +       }
> +
> +       return ret;
> +}
> +
>  static int scpsys_power_on(struct generic_pm_domain *genpd)
>  {
>         struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
> @@ -321,13 +349,9 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
>         if (ret < 0)
>                 goto err_pwr_ack;
>
> -       if (scpd->data->bus_prot_mask) {
> -               ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
> -                               scpd->data->bus_prot_mask,
> -                               scp->bus_prot_reg_update);
> -               if (ret)
> -                       goto err_pwr_ack;
> -       }
> +       ret = scpsys_bus_protect_disable(scpd);
> +       if (ret < 0)
> +               goto err_pwr_ack;
>
>         return 0;
>
> @@ -349,13 +373,9 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
>         u32 val;
>         int ret, tmp;
>
> -       if (scpd->data->bus_prot_mask) {
> -               ret = mtk_infracfg_set_bus_protection(scp->infracfg,
> -                               scpd->data->bus_prot_mask,
> -                               scp->bus_prot_reg_update);
> -               if (ret)
> -                       goto out;
> -       }
> +       ret = scpsys_bus_protect_enable(scpd);
> +       if (ret < 0)
> +               goto out;
>
>         ret = scpsys_sram_disable(scpd, ctl_addr);
>         if (ret < 0)
> --
> 2.18.0
>