linux-kernel - Re: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

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Date:	Sat, 5 May 2007 20:07:15 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Paul Fulghum <paulkf@...rogate.com>,
	Antonino Ingargiola <tritemio@...il.com>,
	linux-usb-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

Am Samstag, 5. Mai 2007 18:36 schrieb Alan Cox:
> > In the serial driver this usually just results in dropping
> > RTS to signal the remote end to stop sending. The serial
> > driver always immediately gives receive data to the tty buffering
> > without regard to the throttled state.
> > 
> > I would argue that cdc-acm should do the same as the serial driver.
> 
> This is a bug in cdc-acm really. It should not double buffer, but to be
> fair to the authors prior to the new tty buffering it *had* to do this.

Hi,

should I understand this so that, if tty_buffer_request_room() returns
less than requested, the rest of the data should be dropped on the
floor?

	Regards
		Oliver
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