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

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Date:	Fri, 5 Feb 2010 22:59:33 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	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

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.

	Regards
		Oliver
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