linux-kernel - Re: [PATCH] PM: sleep: Fix error handling in dpm

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Date:   Fri, 17 Dec 2021 18:21:14 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM: sleep: Fix error handling in dpm_prepare()

On Thu, 16 Dec 2021 at 20:30, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Commit 2aa36604e824 ("PM: sleep: Avoid calling put_device() under
> dpm_list_mtx") forgot to update the while () loop termination
> condition to also break the loop if error is nonzero, which
> causes the loop to become infinite if device_prepare() returns
> an error for one device.
>
> Add the missing !error check.
>
> Fixes: 2aa36604e824 ("PM: sleep: Avoid calling put_device() under dpm_list_mtx")
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Thomas Hellström <thomas.hellstrom@...ux.intel.com>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

Kind regards
Uffe

> ---
>  drivers/base/power/main.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: linux-pm/drivers/base/power/main.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/main.c
> +++ linux-pm/drivers/base/power/main.c
> @@ -1902,7 +1902,7 @@ int dpm_prepare(pm_message_t state)
>         device_block_probing();
>
>         mutex_lock(&dpm_list_mtx);
> -       while (!list_empty(&dpm_list)) {
> +       while (!list_empty(&dpm_list) && !error) {
>                 struct device *dev = to_device(dpm_list.next);
>
>                 get_device(dev);
>
>
>