From 64dbee31050d5b93b5fcda25508e4d3c69f6589c Mon Sep 17 00:00:00 2001 From: Peter Hurley <peter@hurleysoftware.com> Date: Thu, 16 Oct 2014 16:54:26 -0400 Subject: [PATCH] serial: core: Remove extra locking in uart_write() uart_start() only claims the port->lock to call __uart_start(), which does the actual processing. Eliminate the extra acquire/release in uart_write(); call __uart_start() directly with port->lock already held. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/tty/serial/serial_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index e0082b73c198..0282eaaff517 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -537,9 +537,10 @@ static int uart_write(struct tty_struct *tty, count -= c; ret += c; } + + __uart_start(tty); spin_unlock_irqrestore(&port->lock, flags); - uart_start(tty); return ret; } -- 2.34.1