From 977757311e50dc5d832c9fef34e7555411f7ccd8 Mon Sep 17 00:00:00 2001
From: Fabian Godehardt <fg@emlix.com>
Date: Thu, 11 Jun 2009 14:37:19 +0100
Subject: imx: serial: notify higher layers in case xmit IRQ was not called

upper layers, namely line discipline, need to be notified
when transmission of more data is possible. For spurious
cases, where IRQ handling does not supply notification
for sure, it is given additionally here, when data has just
been transmitted and space in the buffer will most probably
be available.

Signed-off-by: Fabian Godehardt <fg@emlix.com>
Signed-off-by: Oskar Schirmer <os@emlix.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 6b8f12f4..49f2e12 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -308,6 +308,9 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
 			break;
 	}
 
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&sport->port);
+
 	if (uart_circ_empty(xmit))
 		imx_stop_tx(&sport->port);
 }
-- 
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