1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 6120922f459f..f3c636d23718 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -67,6 +67,7 @@
 #include <linux/compat.h>
 #include <linux/suspend.h>
 #include <linux/freezer.h>
+#include <linux/smp_lock.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>          /* for invalidate_bdev() */
 #include <linux/completion.h>
@@ -476,7 +477,7 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
         pos = ((loff_t) bio->bi_sector << 9) + lo->lo_offset;
 
         if (bio_rw(bio) == WRITE) {
-                bool barrier = bio_rw_flagged(bio, BIO_RW_BARRIER);
+                bool barrier = (bio->bi_rw & REQ_HARDBARRIER);
                 struct file *file = lo->lo_backing_file;
 
                 if (barrier) {
@@ -831,7 +832,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
         lo->lo_queue->unplug_fn = loop_unplug;
 
         if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync)
-                blk_queue_ordered(lo->lo_queue, QUEUE_ORDERED_DRAIN, NULL);
+                blk_queue_ordered(lo->lo_queue, QUEUE_ORDERED_DRAIN);
 
         set_capacity(lo->lo_disk, size);
         bd_set_size(bdev, size << 9);
@@ -1408,9 +1409,11 @@ static int lo_open(struct block_device *bdev, fmode_t mode)
 {
         struct loop_device *lo = bdev->bd_disk->private_data;
 
+        lock_kernel();
         mutex_lock(&lo->lo_ctl_mutex);
         lo->lo_refcnt++;
         mutex_unlock(&lo->lo_ctl_mutex);
+        unlock_kernel();
 
         return 0;
 }
@@ -1420,6 +1423,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
         struct loop_device *lo = disk->private_data;
         int err;
 
+        lock_kernel();
         mutex_lock(&lo->lo_ctl_mutex);
 
         if (--lo->lo_refcnt)
@@ -1444,6 +1448,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
 out:
         mutex_unlock(&lo->lo_ctl_mutex);
 out_unlocked:
+        lock_kernel();
         return 0;
 }