s390/cio: Initialize the host addresses in pfn_array

Let's initialize the host address to something that is invalid,
rather than letting it default to zero.  This just makes it easier
to notice when a pin operation has failed or been skipped.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20190514234248.36203-5-farman@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index e33265f..086faf2 100644 (file)
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -91,8 +91,11 @@ static int pfn_array_alloc(struct pfn_array *pa, u64 iova, unsigned int len)
        pa->pa_pfn = pa->pa_iova_pfn + pa->pa_nr;
 
        pa->pa_iova_pfn[0] = pa->pa_iova >> PAGE_SHIFT;
-       for (i = 1; i < pa->pa_nr; i++)
+       pa->pa_pfn[0] = -1ULL;
+       for (i = 1; i < pa->pa_nr; i++) {
                pa->pa_iova_pfn[i] = pa->pa_iova_pfn[i - 1] + 1;
+               pa->pa_pfn[i] = -1ULL;
+       }
 
        return 0;
 }