linux-kernel - [PATCH 12/20] serial: stm32: fix last

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Date:   Mon, 26 Jun 2017 12:49:13 +0000
From:   Bich HEMON <bich.hemon@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "Jiri Slaby" <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Bich HEMON <bich.hemon@...com>
Subject: [PATCH 12/20] serial: stm32: fix last_res value

From: Bich Hemon <bich.hemon@...com>

Set last_res value in each port

Signed-off-by: Bich Hemon <bich.hemon@...com>
---
 drivers/tty/serial/stm32-usart.c | 6 +++---
 drivers/tty/serial/stm32-usart.h | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index a7401b0..c54b89d 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -155,14 +155,13 @@ static void stm32_receive_chars(struct uart_port *port, bool threaded)
 	unsigned long c;
 	u32 sr;
 	char flag;
-	static int last_res = RX_BUF_L;
 
 	if (port->irq_wake)
 		pm_wakeup_event(tport->tty->dev, 0);
 
-	while (stm32_pending_rx(port, &sr, &last_res, threaded)) {
+	while (stm32_pending_rx(port, &sr, &stm32_port->last_res, threaded)) {
 		sr |= USART_SR_DUMMY_RX;
-		c = stm32_get_char(port, &sr, &last_res);
+		c = stm32_get_char(port, &sr, &stm32_port->last_res);
 		flag = TTY_NORMAL;
 		port->icount.rx++;
 
@@ -808,6 +807,7 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
 	stm32_ports[id].port.line = id;
 	stm32_ports[id].fifoen = true;
 	stm32_ports[id].rx_irq = USART_CR1_RXNEIE;
+	stm32_ports[id].last_res = RX_BUF_L;
 	return &stm32_ports[id];
 }
 
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index f9fe15b..056a837 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -226,6 +226,7 @@ struct stm32_port {
 	dma_addr_t tx_dma_buf;   /* dma tx buffer bus address */
 	unsigned char *tx_buf;   /* dma tx buffer cpu address */
 	u32 rx_irq;		 /* USART_CR1_RXNEIE or RTOIE */
+	int last_res;
 	bool tx_dma_busy;	 /* dma tx busy               */
 	bool hw_flow_control;
 	bool fifoen;
-- 
1.9.1