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| author | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:49:59 -0500 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:50:00 +1100 |
| commit | 426e3e0af5d2473e67d4256fc1340b7faebd1cc7 (patch) | |
| tree | 29912e63889e45307f41ef08116ecd895b17e21c /drivers/virtio/virtio_ring.c | |
| parent | 3309daaad724dd08eb598bf9c12b7bb9daddd706 (diff) | |
virtio: clarify NO_NOTIFY flag usage
The other side (host) can set the NO_NOTIFY flag as an optimization,
to say "no need to kick me when you add things". Make it clear that
this is advisory only; especially that we should always notify when
the ring is full.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio/virtio_ring.c')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 342bb0363fbe..dbe1d35db32a 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -87,6 +87,8 @@ static int vring_add_buf(struct virtqueue *_vq, if (vq->num_free < out + in) { pr_debug("Can't add buf len %i - avail = %i\n", out + in, vq->num_free); + /* We notify *even if* VRING_USED_F_NO_NOTIFY is set here. */ + vq->notify(&vq->vq); END_USE(vq); return -ENOSPC; } |