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serial: bfin_uart: Don't switch baud rate untill the transfer buffer is empty. 

set_termios may be invoked before the former data transfer is completed.
Block until the tranfer is done.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sonic Zhang 2012-11-19 14:40:56 +08:00 committed by Greg Kroah-Hartman
parent 159a8e92fd
commit 1cd3f2d2c9
1 changed files with 9 additions and 0 deletions
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9
drivers/tty/serial/bfin_uart.c
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@ -799,6 +799,7 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
unsigned long flags;
unsigned int baud, quot;
unsigned int ier, lcr = 0;
unsigned long timeout;
switch (termios->c_cflag & CSIZE) {
case CS8:
@ -868,6 +869,14 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
/* Wait till the transfer buffer is empty */
timeout = jiffies + msecs_to_jiffies(10);
while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
if (time_after(jiffies, timeout)) {
dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
break;
}
/* Disable UART */
ier = UART_GET_IER(uart);
UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);