virtio: console: Add a list of portdevs that are active

The virtio_console.c driver is capable of handling multiple devices at a
time. Maintain a list of devices for future traversal.

Signed-off-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 2f4f0b2..b70fe96 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -48,6 +48,9 @@ struct ports_driver_data {
        /* Used for exporting per-port information to debugfs */
        struct dentry *debugfs_dir;
 
+       /* List of all the devices we're handling */
+       struct list_head portdevs;
+
        /* Number of devices this driver is handling */
        unsigned int index;
 
@@ -108,6 +111,9 @@ struct port_buffer {
  * ports for that device (vdev->priv).
  */
 struct ports_device {
+       /* Next portdev in the list, head is in the pdrvdata struct */
+       struct list_head list;
+
        /*
         * Workqueue handlers where we process deferred work after
         * notification
@@ -1599,6 +1605,10 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
                add_port(portdev, 0);
        }
 
+       spin_lock_irq(&pdrvdata_lock);
+       list_add_tail(&portdev->list, &pdrvdata.portdevs);
+       spin_unlock_irq(&pdrvdata_lock);
+
        __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
                           VIRTIO_CONSOLE_DEVICE_READY, 1);
        return 0;
@@ -1625,6 +1635,10 @@ static void virtcons_remove(struct virtio_device *vdev)
 
        portdev = vdev->priv;
 
+       spin_lock_irq(&pdrvdata_lock);
+       list_del(&portdev->list);
+       spin_unlock_irq(&pdrvdata_lock);
+
        /* Disable interrupts for vqs */
        vdev->config->reset(vdev);
        /* Finish up work that's lined up */
@@ -1691,6 +1705,7 @@ static int __init init(void)
                           PTR_ERR(pdrvdata.debugfs_dir));
        }
        INIT_LIST_HEAD(&pdrvdata.consoles);
+       INIT_LIST_HEAD(&pdrvdata.portdevs);
 
        return register_virtio_driver(&virtio_console);
 }