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

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Message-ID: <20100128223233.GA1358@kroah.com>
Date:	Thu, 28 Jan 2010 14:32:33 -0800
From:	Greg KH <greg@...ah.com>
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 Thu, Jan 28, 2010 at 07:40:12PM +0100, Oliver Neukum wrote:
> 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.

Ok, thanks for letting me know.

greg k-h
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