linux-kernel - Re: [PATCH] USB: ftdi_sio: Fix read regression in 2.6.31.

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Date:	Sat, 19 Sep 2009 12:20:53 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Johan Hovold <jhovold@...il.com>
cc:	Greg KH <greg@...ah.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	<linux-usb@...r.kernel.org>, e9hack <e9hack@...glemail.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: ftdi_sio: Fix read regression in 2.6.31.

On Sat, 19 Sep 2009, Johan Hovold wrote:

> Use ASYNCB_INITIALIZED to determine when to stop reading.
> 
> Since 335f8514f200e63d689113d29cb7253a5c282967 port count can no longer
> be used to determine when to stop reading from the device as it can be
> zero when the first read callbacks are made (see tty_port_block_til_read
> where port count is temporarily decremented during serial_open).
> 
> This fixes the regression where reads fail after connecting the device
> and opening the port more than once (reads usually succeed after the
> first open due to the device latency timer then being set to the default
> 16ms rather than 1ms).

This is a good change.  It should be made in all the serial drivers, 
not just ftdi_sio.  How'd you like to submit patches for all the rest 
of the drivers?

Alan Stern

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