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serial: pl011: Drop duplicate loop counter 

pl011_fifo_to_tty() has two counters (max_count and fifotaken) for the
same loop.  One counter should suffice.  This saves one subtraction per
character read from the RX FIFO.

Cc: Mathias Duckeck <m.duckeck@kunbus.de>
Cc: Phil Elwell <phil@raspberrypi.org>
Cc: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner 2017-11-25 00:40:49 +01:00 committed by Greg Kroah-Hartman
parent f859722a8f
commit e73be92d82
1 changed files with 2 additions and 4 deletions
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6
drivers/tty/serial/amba-pl011.c
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@ -314,10 +314,9 @@ static void pl011_write(unsigned int val, const struct uart_amba_port *uap,
static int pl011_fifo_to_tty(struct uart_amba_port *uap)
{
u16 status;
unsigned int ch, flag, max_count = 256;
int fifotaken = 0;
unsigned int ch, flag, fifotaken;
while (max_count--) {
for (fifotaken = 0; fifotaken != 256; fifotaken++) {
status = pl011_read(uap, REG_FR);
if (status & UART01x_FR_RXFE)
break;
@ -326,7 +325,6 @@ static int pl011_fifo_to_tty(struct uart_amba_port *uap)
ch = pl011_read(uap, REG_DR) | UART_DUMMY_DR_RX;
flag = TTY_NORMAL;
uap->port.icount.rx++;
fifotaken++;
if (unlikely(ch & UART_DR_ERROR)) {
if (ch & UART011_DR_BE) {