linux-kernel - Re: [PATCH] USB: cdc-acm: Prevent data loss when filling tty buffer.

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Message-Id: <201103220907.42552.oneukum@suse.de>
Date:	Tue, 22 Mar 2011 09:07:42 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Toby Gray <toby.gray@...lvnc.com>,
	"Greg Kroah-Hartman" <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: cdc-acm: Prevent data loss when filling tty buffer.

Am Montag, 21. März 2011, 17:56:12 schrieb Alan Cox:
> On Mon, 21 Mar 2011 15:52:25 +0000
> Toby Gray <toby.gray@...lvnc.com> wrote:
> 
> > When sending large quantities of data through a CDC ACM channel it is possible
> > for data to be lost when attempting to copy the data to the tty buffer. This
> > occurs due to the return value from tty_insert_flip_string not being checked.
> 
> For a tty that is normally the right thing to do - no flow control was
> asserted and the internal 64K of buffering was overrun so discard.

But should we really randomly discard a part of a buffer?
If this happens the better alternative approach would be to nuke all buffers
we currently have.

	Regards
		Oliver
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