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Commit f5968b37 authored by Kumar Gala's avatar Kumar Gala Committed by Russell King
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[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: default avatarKumar Gala <galak@kernel.crashing.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 62073902

drivers/serial/8250.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

}