[PATCH] tty:serial:imx: use spin_lock instead of spin_lock_irqsave in isr

[jun qian]

Before the program enters the uart ISR, the local interrupt has been
disabled by the system, so it's not appropriate to use spin_lock_irqsave
interface in the ISR.

Signed-off-by: jun qian <hangdia...@163.com>
---
 drivers/tty/serial/imx.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 239c0fa2e981..3069ee93583e 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -706,27 +706,25 @@ static irqreturn_t imx_uart_rtsint(int irq, void *dev_id)
 {
        struct imx_port *sport = dev_id;
        u32 usr1;
-       unsigned long flags;
 
-       spin_lock_irqsave(&sport->port.lock, flags);
+       spin_lock(&sport->port.lock);
 
        imx_uart_writel(sport, USR1_RTSD, USR1);
        usr1 = imx_uart_readl(sport, USR1) & USR1_RTSS;
        uart_handle_cts_change(&sport->port, !!usr1);
        wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
 
-       spin_unlock_irqrestore(&sport->port.lock, flags);
+       spin_unlock(&sport->port.lock);
        return IRQ_HANDLED;
 }
 
 static irqreturn_t imx_uart_txint(int irq, void *dev_id)
 {
        struct imx_port *sport = dev_id;
-       unsigned long flags;
 
-       spin_lock_irqsave(&sport->port.lock, flags);
+       spin_lock(&sport->port.lock);
        imx_uart_transmit_buffer(sport);
-       spin_unlock_irqrestore(&sport->port.lock, flags);
+       spin_unlock(&sport->port.lock);
        return IRQ_HANDLED;
 }
 
@@ -735,9 +733,8 @@ static irqreturn_t imx_uart_rxint(int irq, void *dev_id)
        struct imx_port *sport = dev_id;
        unsigned int rx, flg, ignored = 0;
        struct tty_port *port = &sport->port.state->port;
-       unsigned long flags;
 
-       spin_lock_irqsave(&sport->port.lock, flags);
+       spin_lock(&sport->port.lock);
 
        while (imx_uart_readl(sport, USR2) & USR2_RDR) {
                u32 usr2;
@@ -797,7 +794,7 @@ static irqreturn_t imx_uart_rxint(int irq, void *dev_id)
        }
 
 out:
-       spin_unlock_irqrestore(&sport->port.lock, flags);
+       spin_unlock(&sport->port.lock);
        tty_flip_buffer_push(port);
        return IRQ_HANDLED;
 }
@@ -903,13 +900,11 @@ static irqreturn_t imx_uart_int(int irq, void *dev_id)
        }
 
        if (usr1 & USR1_DTRD) {
-               unsigned long flags;
-
                imx_uart_writel(sport, USR1_DTRD, USR1);
 
-               spin_lock_irqsave(&sport->port.lock, flags);
+               spin_lock(&sport->port.lock);
                imx_uart_mctrl_check(sport);
-               spin_unlock_irqrestore(&sport->port.lock, flags);
+               spin_unlock(&sport->port.lock);
 
                ret = IRQ_HANDLED;
        }
-- 
2.17.1