Date: Mon, 29 May 2006 12:01:02 -0300
From: "Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>
To: Pete Zaitcev <zaitcev@redhat.com>
Cc: Frank Gevaerts <frank.gevaerts@fks.be>, linux-kernel@vger.kernel.org,
       gregkh@suse.de, linux-usb-devel@lists.sourceforge.net,
       zaitcev@redhat.com
Subject: Re: usb-serial ipaq kernel problem
Message-ID: <20060529120102.1bc28bf2@doriath.conectiva>
In-Reply-To: <20060526133410.9cfff805.zaitcev@redhat.com>
References: <20060526182217.GA12687@fks.be>
	<20060526133410.9cfff805.zaitcev@redhat.com>
Organization: Mandriva
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 Hi Pete,

On Fri, 26 May 2006 13:34:10 -0700
Pete Zaitcev <zaitcev@redhat.com> wrote:

| On Fri, 26 May 2006 20:22:17 +0200, Frank Gevaerts <frank.gevaerts@fks.be> wrote:
| 
| > usb 1-4.5.7: USB disconnect, address 79
| > ------------[ cut here ]------------
| > kernel BUG at kernel/workqueue.c:110!
| 
| Please let me know if this helps:
| 
| --- linux-2.6.17-rc2/drivers/usb/serial/usb-serial.c	2006-04-23 21:06:18.000000000 -0700
| +++ linux-2.6.17-rc2-lem/drivers/usb/serial/usb-serial.c	2006-05-22 21:23:29.000000000 -0700
| @@ -162,6 +162,8 @@ static void destroy_serial(struct kref *
|  		}
|  	}
|  
| +	flush_scheduled_work();		/* port->work */
| +
|  	usb_put_dev(serial->dev);
|  
|  	/* free up any memory that we allocated */

 IIUC, the problem occurred before the call to destroy_serial(),
otherwise it should be in the backtrace.

 It seems that 'port->work' is becoming NULL when the device is
disconnected, but the ipaq_write_bulk_callback() is executing after
that.

 I'm checking this also.

-- 
Luiz Fernando N. Capitulino
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