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xen/grant-table: never put a reserved grant on the free list
[linux-2.6-microblaze.git]
/
drivers
/
xen
/
grant-table.c
diff --git
a/drivers/xen/grant-table.c
b/drivers/xen/grant-table.c
index
6ea31ea
..
1a1aec0
100644
(file)
--- 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;