[IPV4/IPV6] Replace spin_lock_irq with spin_lock_bh

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

In light of my recent patch to net/ipv4/udp.c that replaced the
spin_lock_irq calls on the receive queue lock with spin_lock_bh,
here is a similar patch for all other occurences of spin_lock_irq
on receive/error queue locks in IPv4 and IPv6.

In these stacks, we know that they can only be entered from user
or softirq context.  Therefore it's safe to disable BH only.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> 

Since this patch simply improves the consistent use of locking
primitives rather fixing any real bugs, it should probably go
into net-2.6.13.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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