K 10
svn:author
V 7
rwatson
K 8
svn:date
V 27
2009-08-23T21:00:21.333968Z
K 7
svn:log
V 489
Rather than using IFNET_RLOCK() when iterating over (and modifying) the
ifnet list during if_ef load, directly acquire the ifnet_sxlock
exclusively.  That way when if_alloc() recurses the lock, it's a write
recursion rather than a read->write recursion.

This code structure is arguably a bug, so add a comment indicating that
this is the case.  Post-8.0, we should fix this, but this commit
resolves panic-on-load for if_ef.

Discussed with:	bz, julian
Reported by:	phk
MFC after:	3 days

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