xen/xenbus: client: Fix call of virt_to_mfn in xenbus_grant_ring

virt_to_mfn should take a void* rather an unsigned long. While it
doesn't really matter now, it would throw a compiler warning later when
virt_to_mfn will enforce the type.

At the same time, avoid to compute new virtual address every time in the
loop and directly increment the parameter as we don't use it later.

Signed-off-by: Julien Grall <julien.grall@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index a014016eb7b0f87e6bebf95a2e0f3927d8d5101e..9ad327238ba931243967455b5790916dc6b184f1 100644 (file)
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -379,16 +379,16 @@ int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr,
        int i, j;
 
        for (i = 0; i < nr_pages; i++) {
-               unsigned long addr = (unsigned long)vaddr +
-                       (PAGE_SIZE * i);
                err = gnttab_grant_foreign_access(dev->otherend_id,
-                                                 virt_to_mfn(addr), 0);
+                                                 virt_to_mfn(vaddr), 0);
                if (err < 0) {
                        xenbus_dev_fatal(dev, err,
                                         "granting access to ring page");
                        goto fail;
                }
                grefs[i] = err;
+
+               vaddr = vaddr + PAGE_SIZE;
        }
 
        return 0;