Merge tag 'dm-3.5-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm

[karo-tx-linux.git] / mm / hugetlb.c

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 41a647dfb738123023d56bc0174ba2477a0b0ea0..e198831276a3eab77b4a89fc0e1457a5a45d025d 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2157,6 +2157,15 @@ static void hugetlb_vm_op_open(struct vm_area_struct *vma)
                kref_get(&reservations->refs);
 }
 
+static void resv_map_put(struct vm_area_struct *vma)
+{
+       struct resv_map *reservations = vma_resv_map(vma);
+
+       if (!reservations)
+               return;
+       kref_put(&reservations->refs, resv_map_release);
+}
+
 static void hugetlb_vm_op_close(struct vm_area_struct *vma)
 {
        struct hstate *h = hstate_vma(vma);
@@ -2173,7 +2182,7 @@ static void hugetlb_vm_op_close(struct vm_area_struct *vma)
                reserve = (end - start) -
                        region_count(&reservations->regions, start, end);
 
-               kref_put(&reservations->refs, resv_map_release);
+               resv_map_put(vma);
 
                if (reserve) {
                        hugetlb_acct_memory(h, -reserve);
@@ -2991,12 +3000,16 @@ int hugetlb_reserve_pages(struct inode *inode,
                set_vma_resv_flags(vma, HPAGE_RESV_OWNER);
        }
 
-       if (chg < 0)
-               return chg;
+       if (chg < 0) {
+               ret = chg;
+               goto out_err;
+       }
 
        /* There must be enough pages in the subpool for the mapping */
-       if (hugepage_subpool_get_pages(spool, chg))
-               return -ENOSPC;
+       if (hugepage_subpool_get_pages(spool, chg)) {
+               ret = -ENOSPC;
+               goto out_err;
+       }
 
        /*
         * Check enough hugepages are available for the reservation.
@@ -3005,7 +3018,7 @@ int hugetlb_reserve_pages(struct inode *inode,
        ret = hugetlb_acct_memory(h, chg);
        if (ret < 0) {
                hugepage_subpool_put_pages(spool, chg);
-               return ret;
+               goto out_err;
        }
 
        /*
@@ -3022,6 +3035,10 @@ int hugetlb_reserve_pages(struct inode *inode,
        if (!vma || vma->vm_flags & VM_MAYSHARE)
                region_add(&inode->i_mapping->private_list, from, to);
        return 0;
+out_err:
+       if (vma)
+               resv_map_put(vma);
+       return ret;
 }
 
 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)