linux-kernel - Handshaking on USB serial devices

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Message-ID: <47B30291.2040905@davidnewall.com>
Date:	Thu, 14 Feb 2008 01:15:37 +1030
From:	David Newall <davidn@...idnewall.com>
To:	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Handshaking on USB serial devices

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)?
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