diff options
| author |   Michael S. Tsirkin <mst@redhat.com> | 2014-10-07 16:39:42 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:05:23 +0200 |
| commit | e16e12be34648777606a2c03a3526409b38f0e63 (patch) | |
| tree | 36298911ba8eed0a4805c2c30a56d92520d23432 /drivers/s390/kvm/virtio_ccw.c | |
| parent | virtio: add low-level APIs for feature bits (diff) | |
| download | linux-dev-e16e12be34648777606a2c03a3526409b38f0e63.tar.xz linux-dev-e16e12be34648777606a2c03a3526409b38f0e63.zip | |
virtio: use u32, not bitmap for features
It seemed like a good idea to use bitmap for features
in struct virtio_device, but it's actually a pain,
and seems to become even more painful when we get more
than 32 feature bits. Just change it to a u32 for now.
Based on patch by Rusty.
Suggested-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'drivers/s390/kvm/virtio_ccw.c')
| -rw-r--r-- | drivers/s390/kvm/virtio_ccw.c | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c index bda52f18e967..1dbee95838fe 100644 --- a/drivers/s390/kvm/virtio_ccw.c +++ b/drivers/s390/kvm/virtio_ccw.c @@ -701,7 +701,6 @@ static void virtio_ccw_finalize_features(struct virtio_device *vdev) { struct virtio_ccw_device *vcdev = to_vc_device(vdev); struct virtio_feature_desc *features; - int i; struct ccw1 *ccw; ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); @@ -715,19 +714,15 @@ static void virtio_ccw_finalize_features(struct virtio_device *vdev) /* Give virtio_ring a chance to accept features. */ vring_transport_features(vdev); - for (i = 0; i < sizeof(*vdev->features) / sizeof(features->features); - i++) { - int highbits = i % 2 ? 32 : 0; - features->index = i; - features->features = cpu_to_le32(vdev->features[i / 2] - >> highbits); - /* Write the feature bits to the host. */ - ccw->cmd_code = CCW_CMD_WRITE_FEAT; - ccw->flags = 0; - ccw->count = sizeof(*features); - ccw->cda = (__u32)(unsigned long)features; - ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); - } + features->index = 0; + features->features = cpu_to_le32(vdev->features); + /* Write the feature bits to the host. */ + ccw->cmd_code = CCW_CMD_WRITE_FEAT; + ccw->flags = 0; + ccw->count = sizeof(*features); + ccw->cda = (__u32)(unsigned long)features; + ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); + out_free: kfree(features); kfree(ccw); |