serial: mpc52xx: let tx_empty callback return either 0 or TIOCSER_TEMT
authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Mon, 27 Jul 2015 16:09:33 +0000 (18:09 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 5 Aug 2015 05:07:20 +0000 (22:07 -0700)
commit7d07ada047a4e1f5ff98757ce34c0fdd13d8ec93
tree5a73a17f99e11932ffcde80217ee98d7d6648330
parent7b9c5162c1829686baea1962177842c3fa1ea81c
serial: mpc52xx: let tx_empty callback return either 0 or TIOCSER_TEMT

Documenation/serial/driver requests that the tx_empty callback should
return 0 if there are still chars in the fifo or shifter or TIOCSER_TEMT
(0x01) if no character is pending to be sent.

Fix the mpc52xx serial driver to not return MPC52xx_PSC_SR_TXEMP (i.e.
0x0800) but TIOCSER_TEMT as documented.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/serial/mpc52xx_uart.c