linux-kernel - Re: [PATCH 1/1] ACPI/APEI: Fix the returned value in erst_dbg

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Date:	Sat, 15 Dec 2012 00:41:31 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Adrian Huang <adrian.huang@...com>
Cc:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ACPI/APEI: Fix the returned value in erst_dbg_read

On Friday, December 14, 2012 04:08:34 PM Adrian Huang wrote:
> If the persistent store is empty initially, the function 'erst_dbg_read'
> returns a nonzero value. The better way is to return a zero indicating the
> read operation reaches EOF.
> 
> Tested on two different servers.

I'm queuing this up for submission as v3.8 material.

Thanks,
Rafael


> Signed-off-by: Adrian Huang <adrian.huang@...com>
> ---
>  drivers/acpi/apei/erst-dbg.c |   11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/apei/erst-dbg.c b/drivers/acpi/apei/erst-dbg.c
> index 903549d..04ab5c9 100644
> --- a/drivers/acpi/apei/erst-dbg.c
> +++ b/drivers/acpi/apei/erst-dbg.c
> @@ -111,8 +111,17 @@ retry_next:
>  	if (rc)
>  		goto out;
>  	/* no more record */
> -	if (id == APEI_ERST_INVALID_RECORD_ID)
> +	if (id == APEI_ERST_INVALID_RECORD_ID) {
> +		/*
> +		 * If the persistent store is empty initially, the function
> +		 * 'erst_read' below will return "-ENOENT" value. This causes
> +		 * 'retry_next' label is entered again. The returned value
> +		 * should be zero indicating the read operation is EOF.
> +		 */
> +		len = 0;
> +
>  		goto out;
> +	}
>  retry:
>  	rc = len = erst_read(id, erst_dbg_buf, erst_dbg_buf_len);
>  	/* The record may be cleared by others, try read next record */
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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