serial: 8250_port: fix runtime PM use in __do_stop_tx_rs485()

There are calls to serial8250_rpm_{get|put}() in __do_stop_tx_rs485() that are
certainly placed in a wrong location. I dunno how it had been tested with
runtime PM enabled because it is obvious "sleep in atomic context" error.

Besides that serial8250_rpm_get() is called immediately after an IO just
happened. It implies that the device is already powered on, see implementation
of serial8250_em485_rts_after_send() and serial8250_clear_fifos() for the
details.

There is no bug have been seen due to, as I can guess, use of auto suspend mode
when scheduled transaction to suspend is invoked quite lately than it's needed
for a few writes to the port. It might be possible to trigger a warning if
stop_tx_timer fires when device is suspended.

Refactor the code to use runtime PM only in case of timer function.

Fixes: 0c66940d584d ("tty/serial/8250: fix RS485 half-duplex RX")
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>

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 1bd7ea0..a8ecc25 100644 (file)
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -1414,12 +1414,8 @@ static void __do_stop_tx_rs485(struct uart_8250_port *p)
        if (!(p->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
                serial8250_clear_fifos(p);
 
-               serial8250_rpm_get(p);
-
                p->ier |= UART_IER_RLSI | UART_IER_RDI;
                serial_port_out(&p->port, UART_IER, p->ier);
-
-               serial8250_rpm_put(p);
        }
 }
 
@@ -1429,6 +1425,7 @@ static void serial8250_em485_handle_stop_tx(unsigned long arg)
        struct uart_8250_em485 *em485 = p->em485;
        unsigned long flags;
 
+       serial8250_rpm_get(p);
        spin_lock_irqsave(&p->port.lock, flags);
        if (em485 &&
            em485->active_timer == &em485->stop_tx_timer) {
@@ -1436,6 +1433,7 @@ static void serial8250_em485_handle_stop_tx(unsigned long arg)
                em485->active_timer = NULL;
        }
        spin_unlock_irqrestore(&p->port.lock, flags);
+       serial8250_rpm_put(p);
 }
 
 static void __stop_tx_rs485(struct uart_8250_port *p)
@@ -1475,7 +1473,7 @@ static inline void __stop_tx(struct uart_8250_port *p)
                unsigned char lsr = serial_in(p, UART_LSR);
                /*
                 * To provide required timeing and allow FIFO transfer,
-                * __stop_tx_rs485 must be called only when both FIFO and
+                * __stop_tx_rs485() must be called only when both FIFO and
                 * shift register are empty. It is for device driver to enable
                 * interrupt on TEMT.
                 */
@@ -1484,9 +1482,10 @@ static inline void __stop_tx(struct uart_8250_port *p)
 
                del_timer(&em485->start_tx_timer);
                em485->active_timer = NULL;
+
+               __stop_tx_rs485(p);
        }
        __do_stop_tx(p);
-       __stop_tx_rs485(p);
 }
 
 static void serial8250_stop_tx(struct uart_port *port)