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| author | Amit Shah <amit.shah@redhat.com> | 2010-09-02 18:38:30 +0530 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2010-10-21 17:44:03 +1030 |
| commit | e062013c7d22e40ee634b818d28fd615db36998e (patch) | |
| tree | 375eed8979d6f4c77d5846af89490f624e714db6 | |
| parent | b353a6b821627053f82b4e7b907e824cb7a6879c (diff) | |
virtio: console: Reference counting portdev structs is not needed
Explain in a comment why there's no need to reference-count the portdev
struct: when a device is yanked out, we can't do anything more with it
anyway so just give up doing anything more with the data or the vqs and
exit cleanly.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | drivers/char/virtio_console.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 288701ccbf7..c84486b3e43 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1738,6 +1738,14 @@ static void virtcons_remove(struct virtio_device *vdev) unregister_chrdev(portdev->chr_major, "virtio-portsdev"); + /* + * When yanking out a device, we immediately lose the + * (device-side) queues. So there's no point in keeping the + * guest side around till we drop our final reference. This + * also means that any ports which are in an open state will + * have to just stop using the port, as the vqs are going + * away. + */ if (use_multiport(portdev)) { struct port_buffer *buf; unsigned int len; |