Re: [Qemu-devel] [PATCH] vhost-scsi: init backend features earlier

[Jason Wang <jasowang@redhat.com>]

On 09/03/2014 05:02 PM, Michael S. Tsirkin wrote:
> As vhost core uses backend_features during init,
> clear it earlier to avoid using uninitialized
> memory.
> This is harmless since vhost scsi ignores the result
> anyway, but it avoids valgrind errors.
>
> Cc: qemu-stable@nongnu.org
> Cc: Jason Wang <jasowang@redhat.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  hw/scsi/vhost-scsi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
> index ddfe76a..7146e0e 100644
> --- a/hw/scsi/vhost-scsi.c
> +++ b/hw/scsi/vhost-scsi.c
> @@ -238,6 +238,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
>      s->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
>      s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
>      s->dev.vq_index = 0;
> +    s->dev.backend_features = 0;
>  
>      ret = vhost_dev_init(&s->dev, (void *)(uintptr_t)vhostfd,
>                           VHOST_BACKEND_TYPE_KERNEL, true);
> @@ -246,7 +247,6 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
>                     strerror(-ret));
>          return;
>      }
> -    s->dev.backend_features = 0;
>  
>      error_setg(&s->migration_blocker,
>              "vhost-scsi does not support migration");

Acked-by: Jason Wang <jasowang@redhat.com>