linux-kernel - Re: [PATCH] acpi/apei: free lists of resources in einj and erst

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Date:	Mon, 13 Jul 2015 12:43:17 +0300
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Chen, Gong" <gong.chen@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH] acpi/apei: free lists of resources in einj and erst

On Fri, Jul 10, 2015 at 9:14 PM, Luck, Tony <tony.luck@...el.com> wrote:
> --- a/drivers/acpi/apei/einj.c
> +++ b/drivers/acpi/apei/einj.c
> @@ -379,10 +379,9 @@ static int __einj_error_trigger(u64 trigger_paddr, u32 type,
>                         rc = apei_resources_add(&addr_resources,
>                                 trigger_param_region->address,
>                                 trigger_param_region->bit_width/8, true);
> -                       if (rc)
> -                               goto out_fini;
> -                       rc = apei_resources_sub(&trigger_resources,
> -                                       &addr_resources);
> +                       if (!rc)
> +                               rc = apei_resources_sub(&trigger_resources,
> +                                                       &addr_resources);
>                 }
>                 apei_resources_fini(&addr_resources);
>                 if (rc)
>
> This bit looks wrong ... the line right after the this diff ends is
>                         goto out_fini;
>
> so we'll call apei_resources_fini() twice in the rc!=0 case.

As I see it frees different struct apei_resources: here addr_resources and
trigger_resources at the out_fini.

Anyway calling apei_resources_fini twice is safe: it removes and frees ranges
from lists. If these lists are empty apei_resources_fini does nothing.

>
> -Tony
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