aoe: increase net_device reference count while using it
This change eliminates the danger that the user could rmmod the driver for a network interface that is being used for AoE by the aoe driver. Signed-off-by: NEd Cashin <ecashin@coraid.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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