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

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Date:	Tue, 7 Jun 2011 15:56:34 -0700
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Andi Kleen <ak@...ux.intel.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Subject: RE: [PATCH 4/5] ixgbe: Fix incorrect declaration of ixgbevf_mbx_ops

> -----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
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