linux-kernel - Re: [PATCH 02/12][RFC v3] PM / hibernate: Check the success of generating md5 digest before hibernation

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Date:   Wed, 19 Sep 2018 10:36:59 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     "Chen, Yu C" <yu.c.chen@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        kookoo.gu@...el.com
Subject: Re: [PATCH 02/12][RFC v3] PM / hibernate: Check the success of
 generating md5 digest before hibernation

On Wed, Sep 19, 2018 at 9:31 AM Chen Yu <yu.c.chen@...el.com> wrote:
>
> Currently if get_e820_md5() fails, then it will hibernate nevertheless.
> Actually the error code should be propagated to upper caller so that
> the hibernation could be aware of the result and terminates the process
> if md5 digest fails.
>
> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> ---
>  arch/x86/power/hibernate_64.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c
> index f8e3b668d20b..e0de959ad02d 100644
> --- a/arch/x86/power/hibernate_64.c
> +++ b/arch/x86/power/hibernate_64.c
> @@ -265,9 +265,9 @@ static int get_e820_md5(struct e820_table *table, void *buf)
>         return ret;
>  }
>
> -static void hibernation_e820_save(void *buf)
> +static int hibernation_e820_save(void *buf)
>  {
> -       get_e820_md5(e820_table_firmware, buf);
> +       return get_e820_md5(e820_table_firmware, buf);
>  }
>
>  static bool hibernation_e820_mismatch(void *buf)
> @@ -287,8 +287,9 @@ static bool hibernation_e820_mismatch(void *buf)
>         return memcmp(result, buf, MD5_DIGEST_SIZE) ? true : false;
>  }
>  #else
> -static void hibernation_e820_save(void *buf)
> +static int hibernation_e820_save(void *buf)
>  {
> +       return 0;
>  }
>
>  static bool hibernation_e820_mismatch(void *buf)
> @@ -333,9 +334,7 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size)
>
>         rdr->magic = RESTORE_MAGIC;
>
> -       hibernation_e820_save(rdr->e820_digest);
> -
> -       return 0;
> +       return hibernation_e820_save(rdr->e820_digest);
>  }
>
>  /**
> --

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>