tty: Implement a drain delay in the tty port

We need this for devices that cannot flush and wait, but which do not order
data and modem events. Without it we will hang up before all the data
clears the hardware. Needed for the USB changes.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 926d4a5..4d08b6d 100644 (file)
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -308,6 +308,17 @@ int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct f
        if (port->flags & ASYNC_INITIALIZED &&
                        port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
                tty_wait_until_sent(tty, port->closing_wait);
+       if (port->drain_delay) {
+               unsigned int bps = tty_get_baud_rate(tty);
+               long timeout;
+
+               if (bps > 1200)
+                       timeout = max_t(long, (HZ * 10 * port->drain_delay) / bps,
+                                                               HZ / 10);
+               else
+                       timeout = 2 * HZ;
+               schedule_timeout_interruptible(timeout);
+       }
        return 1;
 }
 EXPORT_SYMBOL(tty_port_close_start);

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 9869436..bed5a3d 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -201,6 +201,9 @@ struct tty_port {
        unsigned char           *xmit_buf;      /* Optional buffer */
        int                     close_delay;    /* Close port delay */
        int                     closing_wait;   /* Delay for output */
+       int                     drain_delay;    /* Set to zero if no pure time
+                                                  based drain is needed else
+                                                  set to size of fifo */
 };
 
 /*