linux-kernel - [PATCHv2] serial: samsung: drop the spinlock around uart_write

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Message-Id: <1455858937-2380-1-git-send-email-linux.amoon@gmail.com>
Date:	Fri, 19 Feb 2016 10:45:37 +0530
From:	Anand Moon <linux.amoon@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	Peter Hurley <peter@...leysoftware.com>
Cc:	linux-serial@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Anand Moon <linux.amoon@...il.com>
Subject: [PATCHv2] serial: samsung: drop the spinlock around uart_write_wakeup

From: Anand Moon <linux.amoon@...il.com>

drop the spin_unlock/lock around uart_write_wakeup to protect
write wakeup for uart port.

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
changes logs: drop the previous approch of spin_unlock_irqrestore/save
---
 drivers/tty/serial/samsung.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index d72cd73..0cb70a9 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -758,11 +758,8 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 		goto out;
 	}
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
-		spin_unlock(&port->lock);
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
-		spin_lock(&port->lock);
-	}
 
 	if (uart_circ_empty(xmit))
 		s3c24xx_serial_stop_tx(port);
-- 
1.9.1