linux-kernel - Re: [PATCH 4/5] ixgbe: Fix incorrect declaration of ixgbevf_mbx

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Date:	Wed, 8 Jun 2011 12:04:56 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	"Rose, Gregory V" <gregory.v.rose@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 4/5] ixgbe: Fix incorrect declaration of ixgbevf_mbx_ops

On Tue, Jun 7, 2011 at 15:56, Rose, Gregory V <gregory.v.rose@...el.com> wrote:
>> -----Original Message-----
>> From: Andi Kleen [mailto:andi@...stfloor.org]
>> Sent: Tuesday, June 07, 2011 3:27 PM
>> To: linux-kernel@...r.kernel.org
>> Cc: Andi Kleen; Kirsher, Jeffrey T; Brandeburg, Jesse; Rose, Gregory V
>> Subject: [PATCH 4/5] ixgbe: Fix incorrect declaration of ixgbevf_mbx_ops
>>
>> From: Andi Kleen <ak@...ux.intel.com>
>>
>> The header extern type of ixgbevf_mbx_ops disagreed with
>> the actual declaration. Fix this here.
>>
>> This is rather scary. I haven't tested it. Did this
>> ever work?
>>
>> Cc: jeffrey.t.kirsher@...el.com
>> Cc: jesse.brandeburg@...el.com
>> Cc: gregory.v.rose@...el.com
>> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
>> ---
>>  drivers/net/ixgbevf/ixgbevf.h |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/net/ixgbevf/ixgbevf.h b/drivers/net/ixgbevf/ixgbevf.h
>> index b703f60..a2bbbb3 100644
>> --- a/drivers/net/ixgbevf/ixgbevf.h
>> +++ b/drivers/net/ixgbevf/ixgbevf.h
>> @@ -279,7 +279,7 @@ enum ixgbevf_boards {
>>
>>  extern struct ixgbevf_info ixgbevf_82599_vf_info;
>>  extern struct ixgbevf_info ixgbevf_X540_vf_info;
>> -extern struct ixgbe_mac_operations ixgbevf_mbx_ops;
>> +extern struct ixgbe_mbx_operations ixgbevf_mbx_ops;
>>
>>  /* needed by ethtool.c */
>>  extern char ixgbevf_driver_name[];
>> --
>> 1.7.4.4
>
> [Greg Rose]
> Huh.
>
> Well, mbx ops is a table of 8 pointers and mac ops is a table of 11 pointers, so the copy would have over written 3 * pointer-size words of some other memory.  But the 8 ops copied would have been correct so to the extent that we called them they worked.
>
> Now that I look at it you missed a another spot where the copy is done that uses the ixgbe_mac_operations instead of the ixgbe_mbx_operations.
>
> I'll fix that up.
>
> Nice catch!
>
> - Greg
> --

I have an updated patch by Greg in my queue, which I will be
submitting through David Miller's networking tree.  Thanks Andi and
Greg!

-- 
Cheers,
Jeff
--
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