1 files changed, 3 insertions, 2 deletions

diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 529a08838376..e4a4cefb92b3 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -256,6 +256,9 @@ void gmap_disable(struct gmap *gmap)
 }
 EXPORT_SYMBOL_GPL(gmap_disable);
 
+/*
+ * gmap_alloc_table is assumed to be called with mmap_sem held
+ */
 static int gmap_alloc_table(struct gmap *gmap,
                                unsigned long *table, unsigned long init)
 {
@@ -267,14 +270,12 @@ static int gmap_alloc_table(struct gmap *gmap,
                 return -ENOMEM;
         new = (unsigned long *) page_to_phys(page);
         crst_table_init(new, init);
-        down_read(&gmap->mm->mmap_sem);
         if (*table & _REGION_ENTRY_INV) {
                 list_add(&page->lru, &gmap->crst_list);
                 *table = (unsigned long) new | _REGION_ENTRY_LENGTH |
                         (*table & _REGION_ENTRY_TYPE_MASK);
         } else
                 __free_pages(page, ALLOC_ORDER);
-        up_read(&gmap->mm->mmap_sem);
         return 0;
 }