From cab53dc9e20f74fbd4776ea584ba3b21c957b1a8 Mon Sep 17 00:00:00 2001
From: Dimitris Lampridis <dlampridis@logikonlabs.com>
Date: Thu, 13 Mar 2014 15:11:46 +0200
Subject: [PATCH] tty/serial: omap: fix RX interrupt enable/disable in
 half-duplex TX

Make sure that serial_omap_stop_rx() also disables RDI (Receiver Data Interrupt),
otherwise the interrupt handler will call serial_omap_rdi() to read the new data,
resulting in the transmission being echoed back.

When the half-duplex transmission is complete, in order to reverse the effects of
serial_omap_stop_rx(), we should re-enable:

  * the RX interrupts _without_ overwriting up->ier

  * the UART_LSR_DR bit of the up->port.read_status_mask

Signed-off-by: Dimitris Lampridis <dlampridis@logikonlabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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