>>> On 29.11.16 at 11:50, <jgr...@suse.com> wrote:
> --- a/drivers/scsi/xen-scsifront.c
> +++ b/drivers/scsi/xen-scsifront.c
> @@ -184,8 +184,6 @@ static struct vscsiif_request *scsifront_pre_req(struct 
> vscsifrnt_info *info)
>  
>       ring_req = RING_GET_REQUEST(&(info->ring), ring->req_prod_pvt);
>  
> -     ring->req_prod_pvt++;
Please note the "_pvt" suffix, which stands for "private": This field is
not visible to the backend. Only ring->sring fields are shared, and
the updating of the shared field happens in RING_PUSH_REQUESTS()
and RING_PUSH_REQUESTS_AND_CHECK_NOTIFY().

Jan

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