[SERIAL] 8250 serial console update uart_8250_port ier

On some embedded PowerPC (MPC834x) systems an extra byte would some
times be required to flush data out of the fifo.
serial8250_console_write() was updating the IER in hardware without
also updating the copy in uart_8250_port. This causes issues functions
like serial8250_start_tx() and __stop_tx() to misbehave.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 179c1f065e60a5662498c006f28c48b83828baa1..b1fc97d5f643ea4772b44e22b148b642b279670d 100644 (file)
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2229,6 +2229,7 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count)
         *      and restore the IER
         */
        wait_for_xmitr(up, BOTH_EMPTY);
+       up->ier |= UART_IER_THRI;
        serial_out(up, UART_IER, ier | UART_IER_THRI);
 }