linux-kernel - Re: [Openipmi-developer] [PATCH] IPMI: return correct value from ipmi

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Date:	Thu, 10 Jul 2008 15:16:46 -0500
From:	Corey Minyard <minyard@....org>
To:	Mark Rustad <MRustad@...il.com>
Cc:	openipmi-developer@...ts.sourceforge.net, wim@...ana.be,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>
Subject: Re: [Openipmi-developer] [PATCH] IPMI: return correct value from
 ipmi_write

This patch is correct.

Signed-off-by: Corey Minyard <cminyard@...sta.com>

Mark Rustad wrote:
> From: Mark Rustad <MRustad@...il.com>
>
> This patch corrects the handling of write operations to the IPMI watchdog
> to work as intended by returning the number of characters actually
> processed. Without this patch, an "echo V >/dev/watchdog" enables the
> watchdog if IPMI is providing the watchdog function.
>
> Signed-off-by: Mark Rustad <MRustad@...il.com>
> ---
> I have not checked all of the watchdogs to see if there are others that have
> this problem, but the one I was using before using the IPMI one did work
> right. It was also a big surprise how much the default watchdog timeout
> varies from one to another. Let me tell you that the 10 second default
> for the IPMI watchdog was a real sore spot while tracking this problem down!
> This problem goes back at least as far as 2.6.20, but I generated this patch
> based on 2.6.26-rc9. I have applied, compiled and tested this fix.
>
>  drivers/char/ipmi/ipmi_watchdog.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> --- a/drivers/char/ipmi/ipmi_watchdog.c	2008-07-10 09:31:52.000000000 -0500
> +++ b/drivers/char/ipmi/ipmi_watchdog.c	2008-07-10 09:33:41.000000000 -0500
> @@ -755,9 +755,8 @@ static ssize_t ipmi_write(struct file *f
>  		rv = ipmi_heartbeat();
>  		if (rv)
>  			return rv;
> -		return 1;
>  	}
> -	return 0;
> +	return len;
>  }
>  
>  static ssize_t ipmi_read(struct file *file,
>
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