From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Marco d'Itri" <md@Linux.IT>
Date: Wed, 15 Apr 2009 13:43:31 +0000
Subject: Bug#499868: udev: multiple mac80211 interfaces created on the same
Message-Id: <20090415134331.GA12085@bongo.bofh.it>
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Does anybody have good ideas about how to fix this case?

Everything in the udevinfo output is identical except:

-    ATTR{link_mode}=3D=3D"1"
+    ATTR{link_mode}=3D=3D"0"

-    ATTR{carrier}=3D=3D"1"
-    ATTR{dormant}=3D=3D"0"

-    ATTR{flags}=3D=3D"0x1003"
+    ATTR{flags}=3D=3D"0x1002"

(The first one is the "real" interface.)

----- Forwarded message from Celejar <celejar@gmail.com> -----

=46rom: Celejar <celejar@gmail.com>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: Bug#499868: udev: multiple mac80211 interfaces created on the same
	physical device are incorrectly renamed

Package: udev
Version: 0.125-6
Severity: normal

mac80211 drivers allow multiple interfaces to be created on the same physic=
al
device, so the underlying wmaster0 device can have eth0, eth1 and eth2.  Wh=
en
the driver is first loaded, a udev rule like this is written:

# PCI device 0x14e4:0x4318 (b43)
SUBSYSTEM=3D=3D"net", ACTION=3D=3D"add", DRIVERS=3D=3D"?*", ATTR{address}=
=3D=3D"xx:xx:xx:xx:xx:xx", ATTR{type}=3D=3D"1", KERNEL=3D=3D"wlan*", NAME=
=3D"eth0"

(originally 'NAME=3D"wlan0"', I changed it to eth0)

When I subsequently add an interface with

iw dev wmaster0 interface add eth1 type station

a udev rule like this is added:

# PCI device 0x14e4:0x4318 (b43)
SUBSYSTEM=3D=3D"net", ACTION=3D=3D"add", DRIVERS=3D=3D"?*", ATTR{address}=
=3D=3D"xx:xx:xx:xx:xx:xx", ATTR{type}=3D=3D"1", KERNEL=3D=3D"eth**", NAME=
=3D"eth1"

Then, if I add another interface with

iw dev wmaster0 interface add eth2 type station

it gets caught by the existing rule and I get the infamous 'eth2_rename'
instead of 'eth2'.

I have seen this behavior with both b43 and ath5k.  Perhaps creating multip=
le
ethX interfaces is a corner case, but the documentation should at least warn
about it.


----- End forwarded message -----

--=20
ciao,
Marco

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