linux-kernel - Re: [PATCH 2/2] PM/hibernate: remove the bogus call to get_gendisk in software

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Date:   Wed, 30 Sep 2020 17:45:27 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Minho Ban <mhban@...sung.com>, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 2/2] PM/hibernate: remove the bogus call to get_gendisk in software_resume

On Fri, Sep 25, 2020 at 6:15 PM Christoph Hellwig <hch@....de> wrote:
>
> get_gendisk grabs a reference on the disk and file operation, so this
> code will leak both of them while having absolutely no use for the
> gendisk itself.
>
> This effectively reverts commit 2df83fa4bce421f
> ("PM / Hibernate: Use get_gendisk to verify partition if resume_file is integer format")
>
> Signed-off-by: Christoph Hellwig <hch@....de>

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

> ---
>  kernel/power/hibernate.c | 11 -----------
>  1 file changed, 11 deletions(-)
>
> diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
> index e7aa57fb2fdc33..7d0b99d2e69631 100644
> --- a/kernel/power/hibernate.c
> +++ b/kernel/power/hibernate.c
> @@ -948,17 +948,6 @@ static int software_resume(void)
>
>         /* Check if the device is there */
>         swsusp_resume_device = name_to_dev_t(resume_file);
> -
> -       /*
> -        * name_to_dev_t is ineffective to verify parition if resume_file is in
> -        * integer format. (e.g. major:minor)
> -        */
> -       if (isdigit(resume_file[0]) && resume_wait) {
> -               int partno;
> -               while (!get_gendisk(swsusp_resume_device, &partno))
> -                       msleep(10);
> -       }
> -
>         if (!swsusp_resume_device) {
>                 /*
>                  * Some device discovery might still be in progress; we need
> --
> 2.28.0
>