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Commit c102659d authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

virtio: simplify feature bit handling 



Now that we use u64 for bits, we can simply & them together.

Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent cb3f6d9d

drivers/virtio/virtio.c

+6 −4
Original line number Diff line number Diff line
@@ -160,6 +160,7 @@ static int virtio_dev_probe(struct device *_d) 
	struct virtio_device *dev = dev_to_virtio(_d);

	struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);

	u64 device_features;

	u64 driver_features;

	unsigned status;



	/* We have a driver! */
@@ -168,15 +169,16 @@ static int virtio_dev_probe(struct device *_d) 
	/* Figure out what features the device supports. */

	device_features = dev->config->get_features(dev);



	/* Features supported by both device and driver into dev->features. */

	dev->features = 0;

	/* Figure out what features the driver supports. */

	driver_features = 0;

	for (i = 0; i < drv->feature_table_size; i++) {

		unsigned int f = drv->feature_table[i];

		BUG_ON(f >= 64);

		if (device_features & (1ULL << f))

			__virtio_set_bit(dev, f);

		driver_features |= (1ULL << f);

	}



	dev->features = driver_features & device_features;



	/* Transport features always preserved to pass to finalize_features. */

	for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)

		if (device_features & (1ULL << i))