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virtio: Formally reserve bits 28-31 to be 'transport' features.

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We assign feature bits as required, but it makes sense to reserve some
for the particular transport, rather than the particular device.

Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Rusty Russell 2008-07-25 12:06:07 -05:00
commit dd7c7bc462
2 changed files with 11 additions and 0 deletions
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5
drivers/virtio/virtio.c
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@ -113,6 +113,11 @@ static int virtio_dev_probe(struct device *_d)
set_bit(f, dev->features);
}
/* Transport features are always preserved to pass to set_features. */
for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
if (device_features & (1 << i))
set_bit(i, dev->features);
err = drv->probe(dev);
if (err)
add_status(dev, VIRTIO_CONFIG_S_FAILED);