linux-kernel - Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi

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Date:	Sat, 13 Feb 2010 04:09:01 +0200
From:	Anssi Hannula <anssi.hannula@....fi>
To:	Oliver Neukum <oliver@...kum.org>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, dvomlehn@...co.com,
	gregkh@...e.de, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes"
 causes gobi_loader to hang

On 05.02.2010 23:59, Oliver Neukum wrote:
> Am Freitag, 5. Februar 2010 20:58:17 schrieb Matthew Garrett:
>> drivers/usb/serial/usb-serial.c: usb_serial_port_work - port 0
>> drivers/usb/serial/usb-serial.c: serial_write - port 0, 2048 byte(s)
>> drivers/usb/serial/generic.c: usb_serial_generic_write - port 0, 2048 bytes
>> drivers/usb/serial/generic.c: usb_serial_generic_write - put 512 bytes into fifo
>> drivers/usb/serial/usb-serial.c: serial_write - port 0, 1536 byte(s)
>> drivers/usb/serial/generic.c: usb_serial_generic_write - port 0, 1536 bytes
>> drivers/usb/serial/generic.c: usb_serial_generic_write - put 0 bytes into fifo
>> drivers/usb/serial/generic.c: usb_serial_generic_write - FIFO is full
> 
> OK, could you also get an usbmon trace? This would allow a determination
> whether the submitted URB doesn't finish for some reason, or whether
> no URB is submitted, possibly because a wakeup is missed.

I'm also affected by this regression. Here's an usbmon trace of
gobi_loader hanging:
http://stuff.onse.fi/gobi2000/gobi-regression.mon.log

-- 
Anssi Hannula
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