linux-kernel - [PATCH] 8250 serial transmitter fully empty test

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Message-ID: <4AD61BFE.2000607@softplc.com>
Date:	Wed, 14 Oct 2009 13:44:14 -0500
From:	Dick Hollenbeck <dick@...tplc.com>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH] 8250 serial transmitter fully empty test

When controlling an industrial radio modem it can be necessary to
manipulate the handshake lines in order to control the radio modem's 
transmitter, from userspace.

The transmitter should not be turned off before all characters have been 
transmitted.  serial8250_tx_empty() was reporting that all characters were transmitted 
before they actually were.

Signed-off-by: Dick Hollenbeck <dick@...tplc.com>

View attachment "8250.diff" of type "text/x-patch" (960 bytes)