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| author | Michael S. Tsirkin <mst@redhat.com> | 2012-09-05 21:47:45 +0300 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-09-28 15:05:15 +0930 |
| commit | 6457f126c888b3481fdae6f702e616cd0c79646e (patch) | |
| tree | eae794db0b3983d2a901ecf6471eda6e3f9ff26f /drivers/lguest/lguest_device.c | |
| parent | 75a0a52be3c27b58654fbed2c8f2ff401482b9a4 (diff) | |
| download | linux-6457f126c888b3481fdae6f702e616cd0c79646e.tar.gz linux-6457f126c888b3481fdae6f702e616cd0c79646e.tar.bz2 linux-6457f126c888b3481fdae6f702e616cd0c79646e.zip | |
virtio: support reserved vqs
virtio network device multiqueue support reserves
vq 3 for future use (useful both for future extensions and to make it
pretty - this way receive vqs have even and transmit - odd numbers).
Make it possible to skip initialization for
specific vq numbers by specifying NULL for name.
Document this usage as well as (existing) NULL callback.
Drivers using this not coded up yet, so I simply tested
with virtio-pci and verified that this patch does
not break existing drivers.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lguest_device.c')
| -rw-r--r-- | drivers/lguest/lguest_device.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c index ccb7dfb028fa..fc92ccbd71dc 100644 --- a/drivers/lguest/lguest_device.c +++ b/drivers/lguest/lguest_device.c @@ -263,6 +263,9 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev, struct virtqueue *vq; int err; + if (!name) + return NULL; + /* We must have this many virtqueues. */ if (index >= ldev->desc->num_vq) return ERR_PTR(-ENOENT); |