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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: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masahiro Yamada 2015-10-30 11:39:03 +09:00 committed by Greg Kroah-Hartman
parent c0f160a735
commit 2cda227bba
1 changed files with 1 additions and 10 deletions
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11
drivers/tty/serial/8250/8250_early.c
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@ -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)