Revert "virtio_console: Initialize guest_connected=true for rproc_serial"

This reverts commit 8078db789a92b10ff6e2d713231b5367e014c53b, and
adds a lengthy comment explaining the problem area.

The reverted patch caused opening of ports to fail for rproc_serial.
In probe guest_connected was set to true, but port_fops_open()
fails with -EMFILE if guest_connected already is true.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index e905d5f5305180cd7cc77a8690e51ae53bed3fec..e6ba6b7887e9fdc4b1cd763b2ed15fe1a3910222 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1436,7 +1436,7 @@ static int add_port(struct ports_device *portdev, u32 id)
                 * rproc_serial does not want the console port, only
                 * the generic port implementation.
                 */
-               port->host_connected = port->guest_connected = true;
+               port->host_connected = true;
        else if (!use_multiport(port->portdev)) {
                /*
                 * If we're not using multiport support,
@@ -1752,13 +1752,23 @@ static void in_intr(struct virtqueue *vq)
        port->inbuf = get_inbuf(port);
 
        /*
-        * Don't queue up data when port is closed.  This condition
+        * Normally the port should not accept data when the port is
+        * closed. For generic serial ports, the host won't (shouldn't)
+        * send data till the guest is connected. But this condition
         * can be reached when a console port is not yet connected (no
-        * tty is spawned) and the host sends out data to console
-        * ports.  For generic serial ports, the host won't
-        * (shouldn't) send data till the guest is connected.
+        * tty is spawned) and the other side sends out data over the
+        * vring, or when a remote devices start sending data before
+        * the ports are opened.
+        *
+        * A generic serial port will discard data if not connected,
+        * while console ports and rproc-serial ports accepts data at
+        * any time. rproc-serial is initiated with guest_connected to
+        * false because port_fops_open expects this. Console ports are
+        * hooked up with an HVC console and is initialized with
+        * guest_connected to true.
         */
-       if (!port->guest_connected)
+
+       if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev))
                discard_port_data(port);
 
        spin_unlock_irqrestore(&port->inbuf_lock, flags);