linux-kernel - Re: Handshaking on USB serial devices

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Message-ID: <20080214050211.GB1432@kroah.com>
Date:	Wed, 13 Feb 2008 21:02:11 -0800
From:	Greg KH <greg@...ah.com>
To:	David Newall <davidn@...idnewall.com>
Cc:	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Handshaking on USB serial devices

On Thu, Feb 14, 2008 at 01:15:37AM +1030, David Newall wrote:
> Consider a USB-attached serial port that is set to do RTS/CTS (or
> DSR/DTR) handshaking: What stops the kernel sending more data to it when
> the remote end lowers CTS (or DTR)?

The tty layer should look at the proper flags and not send data on to
the driver in this kind of instance.

Is this not happening properly for you?  If so, which USB serial driver?

thanks,

greg k-h
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