xen/grant-table: remove multiple BUG_ON on gnttab_interface

gnttab_request_version() always sets the gnttab_interface variable
and the assertions to check for empty gnttab_interface is unnecessary.
The patch eliminates multiple such assertions.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 49b381e..7b36b51 100644 (file)
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -664,7 +664,6 @@ static int grow_gnttab_list(unsigned int more_frames)
        unsigned int nr_glist_frames, new_nr_glist_frames;
        unsigned int grefs_per_frame;
 
-       BUG_ON(gnttab_interface == NULL);
        grefs_per_frame = gnttab_interface->grefs_per_grant_frame;
 
        new_nr_grant_frames = nr_grant_frames + more_frames;
@@ -1160,7 +1159,6 @@ EXPORT_SYMBOL_GPL(gnttab_unmap_refs_sync);
 
 static unsigned int nr_status_frames(unsigned int nr_grant_frames)
 {
-       BUG_ON(gnttab_interface == NULL);
        return gnttab_frames(nr_grant_frames, SPP);
 }
 
@@ -1388,7 +1386,6 @@ static int gnttab_expand(unsigned int req_entries)
        int rc;
        unsigned int cur, extra;
 
-       BUG_ON(gnttab_interface == NULL);
        cur = nr_grant_frames;
        extra = ((req_entries + gnttab_interface->grefs_per_grant_frame - 1) /
                 gnttab_interface->grefs_per_grant_frame);
@@ -1423,7 +1420,6 @@ int gnttab_init(void)
        /* Determine the maximum number of frames required for the
         * grant reference free list on the current hypervisor.
         */
-       BUG_ON(gnttab_interface == NULL);
        max_nr_glist_frames = (max_nr_grant_frames *
                               gnttab_interface->grefs_per_grant_frame / RPP);