Commit 64dbee31 authored Oct 16, 2014 by Peter Hurley Committed by Greg Kroah-Hartman Nov 05, 2014

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>

parent 2b702b9b

drivers/tty/serial/serial_core.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}