Messages in this thread Patch in this message | | | From | Doug Anderson <> | Subject | [PATCH 3/3] serial: samsung: Change barrier() to cpu_relax() in console output | Date | Mon, 21 Apr 2014 09:40:36 -0700 |
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The two functions to write out to the console (one used in normal console mode and one in polling console mode) were slightly different. One used a barrier() in its loop and the other a cpu_relax(). The barrier() really doesn't do anything since we're using rd_regl() to read the port anyway. Switch it to cpu_relax() to make things consistent.
No known bugs / issues are fixed by this change--it just makes things more consistent.
Signed-off-by: Doug Anderson <dianders@chromium.org> --- drivers/tty/serial/samsung.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 12442748..1f5505e 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1466,7 +1466,7 @@ s3c24xx_serial_console_putchar(struct uart_port *port, int ch) unsigned int ufcon = rd_regl(port, S3C2410_UFCON); while (!s3c24xx_serial_console_txrdy(port, ufcon)) - barrier(); + cpu_relax(); wr_regb(port, S3C2410_UTXH, ch); } -- 1.9.1.423.g4596e3a
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