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-rw-r--r--Documentation/serial/driver11
-rw-r--r--drivers/serial/serial_core.c2
-rw-r--r--include/linux/serial_core.h1
3 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index 88ad615dd33..77ba0afbe4d 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -186,6 +186,17 @@ hardware.
Locking: port_sem taken.
Interrupts: caller dependent.
+ flush_buffer(port)
+ Flush any write buffers, reset any DMA state and stop any
+ ongoing DMA transfers.
+
+ This will be called whenever the port->info->xmit circular
+ buffer is cleared.
+
+ Locking: port->lock taken.
+ Interrupts: locally disabled.
+ This call must not sleep
+
set_termios(port,termios,oldtermios)
Change the port parameters, including word length, parity, stop
bits. Update read_status_mask and ignore_status_mask to indicate
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 42d2e108b67..9884bc9eecb 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -573,6 +573,8 @@ static void uart_flush_buffer(struct tty_struct *tty)
spin_lock_irqsave(&port->lock, flags);
uart_circ_clear(&state->info->xmit);
+ if (port->ops->flush_buffer)
+ port->ops->flush_buffer(port);
spin_unlock_irqrestore(&port->lock, flags);
tty_wakeup(tty);
}
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index d8f31de632c..1d2faa6592a 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -190,6 +190,7 @@ struct uart_ops {
void (*break_ctl)(struct uart_port *, int ctl);
int (*startup)(struct uart_port *);
void (*shutdown)(struct uart_port *);
+ void (*flush_buffer)(struct uart_port *);
void (*set_termios)(struct uart_port *, struct ktermios *new,
struct ktermios *old);
void (*set_ldisc)(struct uart_port *);