linux-kernel - [RFC/PATCH 09/13] serial: omap: move THRE check to transmit

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Date:	Tue, 21 Aug 2012 12:15:51 +0300
From:	Felipe Balbi <balbi@...com>
To:	alan@...ux.intel.com
Cc:	Tony Lindgren <tony@...mide.com>, Kevin Hilman <khilman@...com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Shubhrajyoti Datta <shubhrajyoti@...com>,
	Felipe Balbi <balbi@...com>
Subject: [RFC/PATCH 09/13] serial: omap: move THRE check to transmit_chars()

since all other IRQ types now do all necessary
checks inside their handlers, transmit_chars()
was the only one left expecting serial_omap_irq()
to check THRE for it. We can move THRE check to
transmit_chars() in order to make serial_omap_irq()
more uniform.

Signed-off-by: Felipe Balbi <balbi@...com>
---
 drivers/tty/serial/omap-serial.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 74a4f0a..6ea24c5 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -195,11 +195,14 @@ static void serial_omap_stop_rx(struct uart_port *port)
 	pm_runtime_put_autosuspend(up->dev);
 }
 
-static void transmit_chars(struct uart_omap_port *up)
+static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
 {
 	struct circ_buf *xmit = &up->port.state->xmit;
 	int count;
 
+	if (!(lsr & UART_LSR_THRE))
+		return;
+
 	if (up->port.x_char) {
 		serial_out(up, UART_TX, up->port.x_char);
 		up->port.icount.tx++;
@@ -367,8 +370,7 @@ static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
 			check_modem_status(up);
 			break;
 		case UART_IIR_THRI:
-			if (lsr & UART_LSR_THRE)
-				transmit_chars(up);
+			transmit_chars(up, lsr);
 			break;
 		case UART_IIR_RX_TIMEOUT:
 			/* FALLTHROUGH */
-- 
1.7.12.rc3

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