From: Janusz Uzycki <j.uzycki@elproma.com.pl>
Date: Fri, 14 Nov 2014 22:24:33 +0000 (+0100)
Subject: serial: mxs-auart: fix gpio change detection on interrupt
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=08f937f4bcbe156773834935018c9bf7874a42f3;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

serial: mxs-auart: fix gpio change detection on interrupt

mxs_auart_modem_status() did't detect gpio's state change
because s->mctrl_prev was modified before by mctrl_gpio_get().
The patch introduces mctrl_temp variable to fix the bug.

Signed-off-by: Janusz Uzycki <j.uzycki@elproma.com.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 0262a6a50834..21b3b3569461 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -799,6 +799,7 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
 {
 	u32 istat;
 	struct mxs_auart_port *s = context;
+	u32 mctrl_temp = s->mctrl_prev;
 	u32 stat = readl(s->port.membase + AUART_STAT);
 
 	istat = readl(s->port.membase + AUART_INTR);
@@ -818,7 +819,7 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
 	    irq == s->gpio_irq[UART_GPIO_DSR] ||
 	    irq == s->gpio_irq[UART_GPIO_RI])
 		mxs_auart_modem_status(s,
-				mctrl_gpio_get(s->gpios, &s->mctrl_prev));
+				mctrl_gpio_get(s->gpios, &mctrl_temp));
 
 	if (istat & AUART_INTR_CTSMIS) {
 		if (CTS_AT_AUART() && s->ms_irq_enabled)