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Commit 2cda227b authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Greg Kroah-Hartman
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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: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c0f160a7

drivers/tty/serial/8250/8250_early.c

+1 −10
Original line number Diff line number Diff line
@@ -96,20 +96,11 @@ 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)