diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2016-08-31 19:46:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-02 15:03:35 +0200 |
| commit | f3bf26326f1cd27b498b44618855512b2f19769b (patch) | |
| tree | 5462de2dfc69f85cc7c95f092a26f75e31307473 /drivers/tty/serial/8250 | |
| parent | b3965767d86cf4534dfe1affbde0453d3224ed7f (diff) | |
| download | linux-f3bf26326f1cd27b498b44618855512b2f19769b.tar.bz2 | |
serial: 8250_port: unify check of em485 variable
Unify the check of em485 variable to be either (em485) or (!em485) instead of
the explicit comparison to NULL.
While here, remove redundant check in __do_stop_tx_rs485() and
__stop_tx_rs485() since the functions ain't called with NULL value of em485
variable.
Cc: "Matwey V. Kornilov" <matwey@sai.msu.ru>
Tested-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index a8ecc253ef66..aa418011381a 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -585,11 +585,11 @@ EXPORT_SYMBOL_GPL(serial8250_rpm_put); */ int serial8250_em485_init(struct uart_8250_port *p) { - if (p->em485 != NULL) + if (p->em485) return 0; p->em485 = kmalloc(sizeof(struct uart_8250_em485), GFP_ATOMIC); - if (p->em485 == NULL) + if (!p->em485) return -ENOMEM; setup_timer(&p->em485->stop_tx_timer, @@ -619,7 +619,7 @@ EXPORT_SYMBOL_GPL(serial8250_em485_init); */ void serial8250_em485_destroy(struct uart_8250_port *p) { - if (p->em485 == NULL) + if (!p->em485) return; del_timer(&p->em485->start_tx_timer); @@ -1402,10 +1402,8 @@ static void serial8250_stop_rx(struct uart_port *port) static void __do_stop_tx_rs485(struct uart_8250_port *p) { - if (!p->em485) - return; - serial8250_em485_rts_after_send(p); + /* * Empty the RX FIFO, we are not interested in anything * received during the half-duplex transmission. @@ -1440,9 +1438,6 @@ static void __stop_tx_rs485(struct uart_8250_port *p) { struct uart_8250_em485 *em485 = p->em485; - if (!em485) - return; - /* * __do_stop_tx_rs485 is going to set RTS according to config * AND flush RX FIFO if required. |