virtio: drop a useless config read

    "virtio: core support for config generation"
fixed reading up 64 bit values, adding generation
checks for such reads.

By mistake, it left an explicit get call in place
as well. the result is that the value is read twice,
the first result is discarded.

Not a big deal since this only happens with virtio
blk and only on boot ATM, so performance isn't
affected, but let's clean it up.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 22d33034b5787f5e12f924c8601442b1cea403fa..1e306f727edcfcecc528e81483998f947ea46459 100644 (file)
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -373,7 +373,6 @@ static inline u64 virtio_cread64(struct virtio_device *vdev,
                                 unsigned int offset)
 {
        u64 ret;
-       vdev->config->get(vdev, offset, &ret, sizeof(ret));
        __virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
        return virtio64_to_cpu(vdev, (__force __virtio64)ret);
 }