linux-kernel - Re: TTY loosing data with u

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Message-ID: <4D83CB7C.8040903@keymile.com>
Date:	Fri, 18 Mar 2011 22:15:40 +0100
From:	Stefan Bigler <stefan.bigler@...mile.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
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

> In essence if you get a value from receive_room it's a guarantee you may
> send that many bytes, it is not a precise instantaneous perfect answer to
> the question "exactly what number of bytes could fit at this precise
> moment".
>
Hi

I have no problem with having more space available than guarantied by
the value of receive_room. But what I see is that the value can be less!
Data will be lost.
My test showed:
  data to queue=201
  receive_room (guarantied space) =287
  real space in queue =0
In the last mail I attached the code for printing, the read_lock was only
added to show a constistant view of all current values.

Stefan
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