[PATCH 4/4] virtio_ring: preserve VIRTIO_F_RING_RESET in transport features

[Andrew Stellman <astellman@stellman-greene.com>]

vring_transport_features() whitelists known transport feature bits and
clears the rest via __virtio_clear_bit(). VIRTIO_F_RING_RESET is
missing from the whitelist, so it is unconditionally cleared during
feature negotiation. Drivers that depend on ring reset capability
silently lose the feature.

Add VIRTIO_F_RING_RESET to the switch statement, matching the other
transport-level features.

Signed-off-by: Andrew Stellman <astellman@stellman-greene.com>
---
 drivers/virtio/virtio_ring.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index fbca7ce..2cb643f 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -3524,6 +3524,8 @@ void vring_transport_features(struct virtio_device *vdev)
 			break;
 		case VIRTIO_F_IN_ORDER:
 			break;
+		case VIRTIO_F_RING_RESET:
+			break;
 		default:
 			/* We don't understand this bit. */
 			__virtio_clear_bit(vdev, i);
-- 
2.34.1