CVS commit: src/sys/net

["Ryota Ozaki" <ozaki-r%netbsd.org@localhost>]

Module Name:    src
Committed By:   ozaki-r
Date:           Wed Feb 15 01:48:44 UTC 2017

Modified Files:
        src/sys/net: if.c

Log Message:
Avoid if_dl and if_sadl to be NULL

Calling if_deactivate_sadl and then if_sadl_setrefs exposes NULL-ed if_dl
and if_sadl to users for a moment. It's harmful because users expect that
they're always non-NULL. Fix it.

Note that a race condition still remains; if_dl and if_sald aren't updated
atomically so a user can see different data from if_dl and if_sadl.
Fortunately none uses both if_dl and if_sadl at the same time, so the race
condition doesn't hurt nobody for now. (In the first place exposing one
data with two ways is problematic?)


To generate a diff of this commit:
cvs rdiff -u -r1.377 -r1.378 src/sys/net/if.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.