From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Wed, 07 Nov 2007 22:08:20 +0800

quoted text
> [NET]: Eliminate duplicate copies of dst_discard
> 
> We have a number of copies of dst_discard scattered around the place which
> all do the same thing, namely free a packet on the input or output paths.
> 
> This patch deletes all of them except dst_discard and points all the users
> to it.
> 
> The only non-trivial bit is decnet where it returns an error.  However,
> conceptually this is identical to the blackhole functions used in IPv4
> and IPv6 which do not return errors.  So they should either all return
> errors or all return zero.  For now I've stuck with the majority and
> picked zero as the return value.
> 
> It doesn't really matter in practice since few if any driver would react
> differently depending on a zero return value or NET_RX_DROP.
> 
> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Applied to net-2.6.25
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