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

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Message-Id: <201001281940.12173.oliver@neukum.org>
Date:	Thu, 28 Jan 2010 19:40:12 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Greg KH <greg@...ah.com>
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

Am Donnerstag, 28. Januar 2010 18:45:46 schrieb Greg KH:
> On Tue, Jan 19, 2010 at 02:20:29PM +0100, Oliver Neukum wrote:
> > Am Montag, 18. Januar 2010 21:14:16 schrieb Matthew Garrett:
> > 
> > > drivers/usb/serial/generic.c: usb_serial_generic_write - port 0, 1565 
> > > bytes
> > > drivers/usb/serial/generic.c: usb_serial_generic_write - put 0 bytes 
> > > into fifo
> > > drivers/usb/serial/generic.c: usb_serial_generic_read_bulk_callback - 
> > > port 0
> > 
> > If the FIFO is full we can do nothing. Please try the attached patch.
> 
> Did we ever determine if the patch below is needed or not?

No. Further discussion cast serious doubt on it, but we have no
experimental evidence I am aware of.

	Regards
		Oliver
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