On Thu, 27 Nov 2014 22:08:09 +0200 "Michael S. Tsirkin" <[email protected]> wrote:
> Negotiate full 64 bit features. > Change u32 to u64, make sure to use 1ULL everywhere. > > Note: devices guarantee that VERSION_1 is clear unless > revision 1 is negotiated. > > Based on patches by Rusty, Thomas Huth and Cornelia. > > Signed-off-by: Rusty Russell <[email protected]> > Signed-off-by: Cornelia Huck <[email protected]> > Signed-off-by: Michael S. Tsirkin <[email protected]> > --- > drivers/s390/kvm/virtio_ccw.c | 30 +++++++++++++++++++++++------- > 1 file changed, 23 insertions(+), 7 deletions(-) > > @@ -691,6 +691,16 @@ static u64 virtio_ccw_get_features(struct virtio_device > *vdev) > > rc = le32_to_cpu(features->features); > > + /* Read second half feature bits from the host. */ s/half feature bits/half of the feature bits/ > + features->index = 1; > + ccw->cmd_code = CCW_CMD_READ_FEAT; > + ccw->flags = 0; > + ccw->count = sizeof(*features); > + ccw->cda = (__u32)(unsigned long)features; We don't need to re-setup the ccw, but it probably doesn't hurt for clarity. > + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); > + if (ret == 0) > + rc |= (u64)le32_to_cpu(features->features) << 32; > + > out_free: > kfree(features); > kfree(ccw); Looks good. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
