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serial: samsung: Change barrier() to cpu_relax() in console output

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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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Doug Anderson 2014-04-21 09:40:36 -07:00 • committed by Greg Kroah-Hartman
commit f94b057268
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/samsung.c
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@ -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);
}