linux-kernel - Re: [PATCH] pseries/le: Fix another endiannes issue in RTAS call from xmon

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Message-ID: <54B8188D.1060907@linux.vnet.ibm.com>
Date:	Thu, 15 Jan 2015 11:44:13 -0800
From:	Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
To:	Laurent Dufour <ldufour@...ux.vnet.ibm.com>, mpe@...erman.id.au
CC:	paulus@...ba.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] pseries/le: Fix another endiannes issue in RTAS call
 from xmon

On 01/15/2015 09:23 AM, Laurent Dufour wrote:
> The commit 3b8a3c010969 ("powerpc/pseries: Fix endiannes issue in RTAS
> call from xmon") was fixing an endianness issue in the call made from
> xmon to RTAS.
> 
> However, as Michael Ellerman noticed, this fix was not complete, the
> token value was not byte swapped. This lead to call an unexpected and
> most of the time unexisting RTAS function, which is silently ignored
> by RTAS.

Nit. Not so much that is silently ignored by RTAS as much as
disable_surveillance silently doesn't check the return status of the
RTAS call. Maybe a check is warranted and reporting of non-success.

-Tyrel

> 
> This fix addresses this hole.
> 
> Reported-by: Michael Ellerman <mpe@...erman.id.au>
> Cc: stable@...r.kernel.org
> Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
> ---
>  arch/powerpc/xmon/xmon.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
> index 5b150f0c5df9..13c6e200b24e 100644
> --- a/arch/powerpc/xmon/xmon.c
> +++ b/arch/powerpc/xmon/xmon.c
> @@ -337,6 +337,7 @@ static inline void disable_surveillance(void)
>  	args.token = rtas_token("set-indicator");
>  	if (args.token == RTAS_UNKNOWN_SERVICE)
>  		return;
> +	args.token = cpu_to_be32(args.token);
>  	args.nargs = cpu_to_be32(3);
>  	args.nret = cpu_to_be32(1);
>  	args.rets = &args.args[3];
> 

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