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From: Tian Tao <tiantao6@hisilicon.com>
To: <gregkh@linuxfoundation.org>, <jirislaby@kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-unisoc@lists.infradead.org>,
	<linux-serial@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH] tty: serial: rad-uart: replace spin_lock_irqsave by spin_lock in hard IRQ
Date: Fri, 20 Nov 2020 09:26:53 +0800	[thread overview]
Message-ID: <1605835613-28359-1-git-send-email-tiantao6@hisilicon.com> (raw)

The code has been in a irq-disabled context since it is hard IRQ. There
is no necessity to do it again.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
---
 drivers/tty/serial/rda-uart.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c
index 85366e0..d6705a0 100644
--- a/drivers/tty/serial/rda-uart.c
+++ b/drivers/tty/serial/rda-uart.c
@@ -406,10 +406,9 @@ static void rda_uart_receive_chars(struct uart_port *port)
 static irqreturn_t rda_interrupt(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
-	unsigned long flags;
 	u32 val, irq_mask;
 
-	spin_lock_irqsave(&port->lock, flags);
+	spin_lock(&port->lock);
 
 	/* Clear IRQ cause */
 	val = rda_uart_read(port, RDA_UART_IRQ_CAUSE);
@@ -426,7 +425,7 @@ static irqreturn_t rda_interrupt(int irq, void *dev_id)
 		rda_uart_send_chars(port);
 	}
 
-	spin_unlock_irqrestore(&port->lock, flags);
+	spin_unlock(&port->lock);
 
 	return IRQ_HANDLED;
 }
-- 
2.7.4


             reply	other threads:[~2020-11-20  1:26 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20  1:26 Tian Tao [this message]
2020-11-20  8:15 ` Johan Hovold

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