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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2008-02-08 13:21:02 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 18:22:37 +0100
commit829dd8112274d46c5ed82d46be506762e2c8fcd8 (patch)
treecda57a693c27372b3553c71dbec7a01af20af9bf
parentatmel_serial: clean up the code (diff)
downloadlinux-829dd8112274d46c5ed82d46be506762e2c8fcd8.tar.xz
linux-829dd8112274d46c5ed82d46be506762e2c8fcd8.zip
atmel_serial: use cpu_relax() when busy-waiting
Replace two instances of barrier() with cpu_relax() since that's the right thing to do when busy-waiting. This does not actually change anything since cpu_relax() is defined as barrier() on both ARM and AVR32. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Acked-by: Andrew Victor <linux@maxim.org.za> Tested-by: Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/serial/atmel_serial.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index bb9c3574caa9..4d1ccc2b762d 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -615,7 +615,7 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
imr = UART_GET_IMR(port);
UART_PUT_IDR(port, -1);
while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY))
- barrier();
+ cpu_relax();
/* disable receiver and transmitter */
UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
@@ -794,7 +794,7 @@ void __init atmel_register_uart_fns(struct atmel_port_fns *fns)
static void atmel_console_putchar(struct uart_port *port, int ch)
{
while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
- barrier();
+ cpu_relax();
UART_PUT_CHAR(port, ch);
}