linux-kernel - Re: [PATCH] USB: ftdi_sio: Remove tty->low

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Date:	Wed, 30 Sep 2009 08:33:30 +0200
From:	Michael Trimarchi <trimarchi@...dalf.sssup.it>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Johan Hovold <jhovold@...il.com>,
	Oliver Neukum <oliver@...kum.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: ftdi_sio: Remove tty->low_latency.

Alan Cox wrote:
>> As it stands today ftdi_sio does indeed call tty_flip_buffer_push from
>> interrupt context with low_latency set and that is obviously incorrect,
>> right?
>>     
>
> It seems to do it from a work queue - or did I miss a case ?
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>   
  usb_fill_bulk_urb(port->read_urb, dev,
                        usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
                        port->read_urb->transfer_buffer,
                                port->read_urb->transfer_buffer_length,
                        ftdi_read_bulk_callback, port);

  (can be call in the interrupt context)
  ftdi_read_bulk_callback--->
                            ftdi_process_read-->      
                                                tty_flip_buffer_push(tty);
                                               
                                               

Michael
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