linux-kernel - Re: Trouble with USB serial driver (ftdi

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Message-ID: <20090914164333.GB25381@kroah.com>
Date:	Mon, 14 Sep 2009 09:43:33 -0700
From:	Greg KH <greg@...ah.com>
To:	e9hack <e9hack@...glemail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Trouble with USB serial driver (ftdi_sio.c) on 2.6.31

On Sat, Sep 12, 2009 at 02:08:31PM +0200, e9hack wrote:
> Hi,
> 
> I've some trouble with the USB serial driver (ftdi_sio.c for a FT232RL from FTDI). If the 
> port is opened for the first time, the driver works perfectly. If the port is closed and 
> open again, it isn't possible to read any data from port. Writing data to the port works. 
> The FT232RL must be reconnect to get it working again. A reboot without reconnect doesn't 
> solve this problem. If I look at the debug output, I don't see read requests from 
> ftdi_sio.c. If reading is possible, I see this read messages:

{sigh}  Yes, this driver is a bit messed up in .31, sorry.  We are
working through it and hope to have a fix in one of the upcoming
.31-stable releases.

thanks,

greg k-h
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