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virtio: Add transport feature handling stub for virtio_ring.

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To prepare for virtio_ring transport feature bits, hook in a call in
all the users to manipulate them.  This currently just clears all the
bits, since it doesn't understand any features.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2008-07-25 12:06:13 -05:00
parent c624896e48
commit e34f872567
5 changed files with 27 additions and 0 deletions
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3
drivers/lguest/lguest_device.c
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@ -105,6 +105,9 @@ static void lg_finalize_features(struct virtio_device *vdev)
/* Second half of bitmap is features we accept. */
u8 *out_features = lg_features(desc) + desc->feature_len;
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
memset(out_features, 0, desc->feature_len);
bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
for (i = 0; i < bits; i++) {