Merge branch 'master' into next

1 files changed, 8 insertions, 7 deletions

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 4de7f02f820b..9c590eef7912 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1151,8 +1151,7 @@ static int try_to_unuse(unsigned int type)
                                 } else
                                         retval = unuse_mm(mm, entry, page);
 
-                                if (set_start_mm &&
-                                    swap_count(*swap_map) < swcount) {
+                                if (set_start_mm && *swap_map < swcount) {
                                         mmput(new_start_mm);
                                         atomic_inc(&mm->mm_users);
                                         new_start_mm = mm;
@@ -1974,12 +1973,14 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
                 goto bad_swap;
         }
 
-        if (blk_queue_nonrot(bdev_get_queue(p->bdev))) {
-                p->flags |= SWP_SOLIDSTATE;
-                p->cluster_next = 1 + (random32() % p->highest_bit);
+        if (p->bdev) {
+                if (blk_queue_nonrot(bdev_get_queue(p->bdev))) {
+                        p->flags |= SWP_SOLIDSTATE;
+                        p->cluster_next = 1 + (random32() % p->highest_bit);
+                }
+                if (discard_swap(p) == 0)
+                        p->flags |= SWP_DISCARDABLE;
         }
-        if (discard_swap(p) == 0)
-                p->flags |= SWP_DISCARDABLE;
 
         mutex_lock(&swapon_mutex);
         spin_lock(&swap_lock);