On Mon, 10 Dec 2012, Cunningham, Robert wrote:
> I believe I have found a critical bug in the smsc75xx driver and would like
> to know the right way to proceed.
>
> Problem:
>
> 1. Environment:
> - Multiple hard-wired SMSC LAN7500 devices connected at boot time and never
> removed (not removable, in my case).
> - Tested under the following Ubuntu ARM-based systems:
> PandaBoard ES: Linux Panda-216 3.5.0-215-omap4 #22-Ubuntu SMP PREEMPT
> Mon Nov 19 16:41:38 UTC 2012 armv7l armv7l armv7l GNU/Linux
> Variscite OM44 DVK: Linux OM44-134 3.4.0-1487-omap4 #6+var5 SMP PREEMPT
> Mon Oct 15 19:18:50 IST 2012 armv7l armv7l armv7l GNU/Linux
> Custom OM44-based system: Linux OM44-120 3.4.0-1487-omap4 #6+var7 SMP
> PREEMPT Sun Oct 28 11:51:16 IST 2012 armv7l armv7l armv7l GNU/Linux
>
> 2. Observations:
> - Expected behavior: A random MAC address is assigned at system start.
> - Unexpected behavior: Doing "ifconfig ethX down; ifconfig ethX up" always
> forces a new random MAC address to be assigned.
> - Unexpected behavior: All attempts to manually assign a MAC address are
> consistently overwritten by a subsequent "ifconfig ethX up".
>
> 3. Desired behavior:
> - I would like to be able to assign desired MAC addresses to any number of
> attached smsc75xx devices that will persist across any number of ifconfig
> up/down cycles.
Didn't you see this email message containing a patch to fix your
problem?
http://marc.info/?l=linux-usb&m=135482307408299&w=2
Alan Stern
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