From 686351f342fa745d10ddef08d0e930cf53b0c673 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Date: Fri, 2 Mar 2018 11:07:21 +0100
Subject: [PATCH] serial: imx: simplify some conditions related to dma
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Neither .dma_is_txing nor .dma_is_rxing can evaluate to true if
.dma_is_enabled evaluates to false:
The only function that sets .dma_is_txing to a non-zero value is
imx_dma_tx() which is only called if .dma_is_enabled is true. Same for
.dma_is_rxing and start_rx_dma(). And before .dma_is_enabled is set to 0
when imx_shutdown calls imx_disable_dma(), .dma_is_rxing and
.dma_is_txing are reset to zero before, too.
For this reason
sport->dma_is_enabled && sport->dma_is_rxing
has the same value as
sport->dma_is_rxing
which allows to simplify three if conditions.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/imx.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 57891d21f20d9..b87e043343427 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -413,7 +413,7 @@ static void imx_stop_tx(struct uart_port *port)
* We are maybe in the SMP context, so if the DMA TX thread is running
* on other cpu, we have to wait for it to finish.
*/
- if (sport->dma_is_enabled && sport->dma_is_txing)
+ if (sport->dma_is_txing)
return;
temp = imx_uart_readl(sport, UCR1);
@@ -442,7 +442,7 @@ static void imx_stop_rx(struct uart_port *port)
struct imx_port *sport = (struct imx_port *)port;
unsigned long temp;
- if (sport->dma_is_enabled && sport->dma_is_rxing) {
+ if (sport->dma_is_rxing) {
if (sport->port.suspended) {
dmaengine_terminate_all(sport->dma_chan_rx);
sport->dma_is_rxing = 0;
@@ -900,7 +900,7 @@ static unsigned int imx_tx_empty(struct uart_port *port)
ret = (imx_uart_readl(sport, USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0;
/* If the TX DMA is working, return 0. */
- if (sport->dma_is_enabled && sport->dma_is_txing)
+ if (sport->dma_is_txing)
ret = 0;
return ret;
--
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