Date: Fri, 15 Oct 2010 15:06:32 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/net if_tun.c Message-ID: <201010151506.o9FF6j2Q071695@repoman.freebsd.org>
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bz 2010-10-15 15:06:32 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_7)
sys/net if_tun.c
Log:
SVN rev 213895 on 2010-10-15 15:06:32Z by bz
MFC r186391,186483,186497 (qingli, kmacy 21 months ago):
r186391:
Provide a condition variable to delay the cloned interface
destroy operation until the referenced clone device has
been closed by the process properly. The behavior is now
consistently with the previous release.
r186483:
- Close a race during which the open flag could be cleared but the
tun_softc would still be referenced by adding a separate TUN_CLOSED
flag that is set after tunclose is done referencing it.
- drop the tun_mtx after the flag check to avoid holding it across
if_detach which can recurse in to if_tun.c
r186497:
The "tun?" dev need not be opened at all. One is allowed to perform
the following operations, e.g.:
1) ifconfig tun0 create
2) ifconfig tun0 10.1.1.1 10.1.1.2
3) route add -net 192.103.54.0/24 -iface tun0
4) ifconfig tun0 destroy
If cv wait on the TUN_CLOSED flag, then the last operation (4) will
block forever.
Revert the previous changes and fix the mtx_unlock() leak.
PR: kern/116837
Submitted by: Mikolaj Golub (to.my.trociny gmail.com)
(Not used the patch, just did the MFC)
Revision Changes Path
1.163.2.5 +11 -2 src/sys/net/if_tun.c
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