diff options
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/grant-table.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 6ea31ea26008..1a1aec0a88a1 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -207,6 +207,10 @@ static inline void check_free_callbacks(void) static void put_free_entry(grant_ref_t ref) { unsigned long flags; + + if (unlikely(ref < GNTTAB_NR_RESERVED_ENTRIES)) + return; + spin_lock_irqsave(&gnttab_list_lock, flags); gnttab_entry(ref) = gnttab_free_head; gnttab_free_head = ref; |