Cc: linux-wireless@vger.kernel.org, Zhu Yi <yi.zhu@intel.com>,
	=?ISO-8859-1?Q?Stefanik_G=E1bo@sc8-sf-spam2-b.sourceforge.net?=,
	ipw3945-devel@lists.sourceforge.net
Message-Id: <62912CC9-C856-4FD1-8642-8A80DB657468@cs.washington.edu> (sfid-20080709_194146_902955_489F51E0)
From: Dan Halperin <dhalperi@cs.washington.edu>
To: Maxim Levitsky <maximlevitsky@gmail.com>
In-Reply-To: <4874E68F.7090106@gmail.com>
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Subject: Re: [ipw3945-devel] [BUG] Two bugs in monitor mode, iwl3945
Date: Wed, 9 Jul 2008 10:04:53 -0700
References: <485F687C.1050407@gmail.com> <4874E68F.7090106@gmail.com>
Sender: linux-wireless-owner@vger.kernel.org

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I've observed that (often?) if you ifconfig wlan0 down before enabling =
=20
monitor/promisc mode, then it seems to not hang the system.

- -Dan

On Jul 9, 2008, at 9:25 AM, Maxim Levitsky wrote:

> Maxim Levitsky wrote:
>> I noticed two bugs:
>>
>> 1) Monitor mode hangs the system randomly, and what is interesting =20
>> that
>> this
>> bug disappears if I patch the driver with packet injection patch fro=
m
>> G=E1bor Stefanik.
>> I noticed this bug, after I removed his patch to see if it caused =20
>> some
>> problems.
>> Always reproducible, usually hangs just after airodump launch.
>>
>> 2) If I enable monitor mode regardless of injection patch, the =20
>> scanning
>> results got garbaged,
>> iwlist scan reports > 100 quality on most APs, or 0% quality on my
>> router, shows extremely low and hi power levels, like
>> -127dBm or 160 dBm, and those levels change rapidly.
>> This why I removed the injection patch, I suspected it, but this bug
>> appears to be not related to it.
> I noticed that exactly same bug happens if I enable promisc mode on =20
> the
> wlan0. Does this give any additional clue why this bug happens?
>
> Best regards,
> 	Maxim levitsky
>
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