linux-kernel - Re: TTY loosing data with u

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Message-ID: <20110318170801.GA2857@legolas.emea.dhcp.ti.com>
Date:	Fri, 18 Mar 2011 19:08:02 +0200
From:	Felipe Balbi <balbi@...com>
To:	Stefan Bigler <stefan.bigler@...mile.com>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: TTY loosing data with u_serial gadget

Hi,

(please don't top-post)

On Fri, Mar 18, 2011 at 05:35:56PM +0100, Stefan Bigler wrote:
> Thanks for your quick answer. Meanwhile we ported our board to 2.6.38.
> We recognize the same problem again.
> I had also a look at the relevant fixes, a lot is done but I could not find
> the required protection of the attribute receive_room.
> 
> I added a printk in case of failure were receive_room shows more
> space that is really available in the queue and also used.
> 
> The printk is attached below and also the log.
> 
> Regards
> Stefan
> 
> 
> Log:
> flush_to_ldisc, receive_room to small count=201, receive_room=287,
> real_room=0
> flush_to_ldisc, receive_room to small count=225, receive_room=1031,
> real_room=0
> flush_to_ldisc, receive_room to small count=33, receive_room=4095,
> real_room=0


I had the same problem while I was working at Nokia developing the N900.
I even sent a patch (twice) with Alan Cox on the loop but nothing has
happened. The patch might still be floating on the archives but
essentially it would make ->receive_buf() return the amount of received
bytes (as IMHO it should be done).

-- 
balbi
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