tty: USB tty devices can block in tcdrain when unplugged

The underlying problem is that the device methods don't all correctly
handle disconnected status and some keep reporting bytes pending which
causes tcdrain to stall.

When the cable is unplugged they are definitely gone, and as this is true
for all USB cables we can fix it in the core usb serial code.

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

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index aafa684a900facf3ee510efa442468998138b763..8d5189096470fe15fa9912c1aea062576fa8310f 100644 (file)
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -339,6 +339,10 @@ static int serial_chars_in_buffer(struct tty_struct *tty)
        dbg("%s = port %d", __func__, port->number);
 
        WARN_ON(!port->port.count);
+       /* if the device was unplugged then any remaining characters
+          fell out of the connector ;) */
+       if (port->serial->disconnected)
+               return 0;
        /* pass on to the driver specific version of this function */
        return port->serial->type->chars_in_buffer(tty);
 }