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dev->hard_start_xmit non-reentrant?

Hi,

Is it guaranteed by the higher layers that dev->hard_start_xmit is 
non-reentrant?
I saw a comment to that effect in loopback.c and wondered if this was true 
for all devices.

TIA.
ciao,
Amit

-- 
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                  Amit Kucheria
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         University of Kansas @ Lawrence
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