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Message-Id: <1413492867-20679-10-git-send-email-peter@hurleysoftware.com> Date: Thu, 16 Oct 2014 16:54:26 -0400 From: Peter Hurley <peter@...leysoftware.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>, One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>, Peter Hurley <peter@...leysoftware.com> Subject: [PATCH -next 09/10] 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@...leysoftware.com> --- 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 e04ae58..6a3571e 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; } -- 2.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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