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Message-Id: <1446172745-5115-2-git-send-email-yamada.masahiro@socionext.com> Date: Fri, 30 Oct 2015 11:39:03 +0900 From: Masahiro Yamada <yamada.masahiro@...ionext.com> To: linux-serial@...r.kernel.org Cc: Peter Hurley <peter@...leysoftware.com>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.com> Subject: [PATCH v3 1/3] serial: 8250_early: do not save and restore IER in write callback The IER has already been masked in early_serial8250_setup(), there is no reason to save and restore it every time early_serial8250_write() is called. Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com> --- drivers/tty/serial/8250/8250_early.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index 7aff3d8..23c322f 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -99,20 +99,11 @@ static void __init early_serial8250_write(struct console *console, { struct earlycon_device *device = console->data; struct uart_port *port = &device->port; - unsigned int ier; - - /* Save the IER and disable interrupts preserving the UUE bit */ - ier = serial8250_early_in(port, UART_IER); - if (ier) - serial8250_early_out(port, UART_IER, ier & UART_IER_UUE); uart_console_write(port, s, count, serial_putc); - /* Wait for transmitter to become empty and restore the IER */ + /* Wait for transmitter to become empty */ wait_for_xmitr(port); - - if (ier) - serial8250_early_out(port, UART_IER, ier); } static void __init init_port(struct earlycon_device *device) -- 1.9.1 -- 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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