mxser_stop_rx() should be called from mxser_shutdown_port() for several
reasons:
1) info->slock is held while manipulating IER (as on other places),
2) hangup now stops rx too,
3) mxser_close() will use tty_port_close() and there is no place except
tty_port_operations::shutdown() where this can be done,
4) this is the same sequence as serial_core does. So we can map this
code 1:1 when switching the driver to it.
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/tty/mxser.c | 31 ++++++++++++++++---------------
1 file changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 6b47a0607f59..45ee1122a5f7 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -807,6 +807,20 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
return 0;
}
+/*
+ * To stop accepting input, we disable the receive line status interrupts, and
+ * tell the interrupt driver to stop checking the data ready bit in the line
+ * status register.
+ */
+static void mxser_stop_rx(struct mxser_port *info)
+{
+ info->IER &= ~UART_IER_RLSI;
+ if (info->board->must_hwid)
+ info->IER &= ~MOXA_MUST_RECV_ISR;
+
+ outb(info->IER, info->ioaddr + UART_IER);
+}
+
/*
* This routine will shutdown a serial port
*/
@@ -817,6 +831,8 @@ static void mxser_shutdown_port(struct tty_port *port)
spin_lock_irqsave(&info->slock, flags);
+ mxser_stop_rx(info);
+
/*
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
* here so the queue might never be waken up
@@ -880,20 +896,6 @@ static void mxser_flush_buffer(struct tty_struct *tty)
tty_wakeup(tty);
}
-/*
- * To stop accepting input, we disable the receive line status interrupts, and
- * tell the interrupt driver to stop checking the data ready bit in the line
- * status register.
- */
-static void mxser_stop_rx(struct mxser_port *info)
-{
- info->IER &= ~UART_IER_RLSI;
- if (info->board->must_hwid)
- info->IER &= ~MOXA_MUST_RECV_ISR;
-
- outb(info->IER, info->ioaddr + UART_IER);
-}
-
/*
* This routine is called when the serial port gets closed. First, we
* wait for the last remaining data to be sent. Then, we unlink its
@@ -908,7 +910,6 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
if (tty_port_close_start(port, tty, filp) == 0)
return;
mutex_lock(&port->mutex);
- mxser_stop_rx(info);
mxser_flush_buffer(tty);
if (tty_port_initialized(port) && C_HUPCL(tty))
tty_port_lower_dtr_rts(port);
--
2.33.1
