netdev - Re: [PATCH] bonding: cleanup bond

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Date:	Mon, 12 Jan 2015 16:43:32 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jtoppins@...ulusnetworks.com
Cc:	netdev@...r.kernel.org, shm@...ulusnetworks.com,
	gospo@...ulusnetworks.com, nikolay@...hat.com
Subject: Re: [PATCH] bonding: cleanup bond_opts array

From: Jonathan Toppins <jtoppins@...ulusnetworks.com>
Date: Fri,  9 Jan 2015 13:31:08 -0500

> Remove the empty array element initializer and size the array with
> BOND_OPT_LAST so the compiler will complain if more elements are in
> there than should be.
> 
> An interesting unwanted side effect of this initializer is that if one
> inserts new options into the middle of the array then this initializer
> will zero out the option that equals BOND_OPT_TLB_DYNAMIC_LB+1.
> 
> Example:
> Extend the OPTS enum:
> enum {
>    ...
>    BOND_OPT_TLB_DYNAMIC_LB,
>    BOND_OPT_LACP_NEW1,
>    BOND_OPT_LAST
> };
> 
> Now insert into bond_opts array:
> static const struct bond_option bond_opts[] = {
>       ...
>       [BOND_OPT_LACP_RATE] = { .... unchanged stuff .... },
>       [BOND_OPT_LACP_NEW1] = { ... new stuff ... },
>       ...
>       [BOND_OPT_TLB_DYNAMIC_LB] = { .... unchanged stuff ....},
>       { } // MARK A
> };
> 
> Since BOND_OPT_LACP_NEW1 = BOND_OPT_TLB_DYNAMIC_LB+1, the last
> initializer (MARK A) will overwrite the contents of BOND_OPT_LACP_NEW1
> and can be easily viewed with the crash utility.
> 
> Signed-off-by: Jonathan Toppins <jtoppins@...ulusnetworks.com>

Applied.
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