Re: usb-serial ipaq kernel problem

[Luiz Fernando N. Capitulino]

On Mon, 29 May 2006 12:01:02 -0300
"Luiz Fernando N. Capitulino" <lcapitulino@xxxxxxxxxxxxxxx> wrote:

| 
|  Hi Pete,
| 
| On Fri, 26 May 2006 13:34:10 -0700
| Pete Zaitcev <zaitcev@xxxxxxxxxx> wrote:
| 
| | On Fri, 26 May 2006 20:22:17 +0200, Frank Gevaerts <frank.gevaerts@xxxxxx> 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.

 Err, I meant 'port->work->entry' is empty, of course.

-- 
Luiz Fernando N. Capitulino
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