K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2019-10-08T17:55:45.754975Z
K 7
svn:log
V 776
Remove epoch assertion from if_setlladdr().  Originally this function was
protected by IF_ADDR_LOCK(), which was a mutex, so that two simultaneous
if_setlladdr() can't execute. Later it was switched to IF_ADDR_RLOCK(),
likely by a mistake. Later it was switched to NET_EPOCH_ENTER(). Then I
incorrectly added NET_EPOCH_ASSERT() here.

In reality ifp->if_addr never goes away and never changes its length. So,
doing bcopy() in it is always "safe", meaning it won't dereference a wrong
pointer or write into someone's else memory. Of course doing two bcopy() in
parallel would result in a mess of two addresses, but net epoch doesn't
protect against that, neither IF_ADDR_RLOCK() did.

So for now, just remove the assertion and leave for later a proper fix.

Reported by:	markj

END