3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jens Axboe <[email protected]>

commit 46f341ffcfb5d8530f7d1e60f3be06cce6661b62 upstream.

Commit 2da78092 changed the locking from a mutex to a spinlock,
so we now longer sleep in this context. But there was a leftover
might_sleep() in there, which now triggers since we do the final
free from an RCU callback. Get rid of it.

Reported-by: Pontus Fuchs <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 block/genhd.c |    2 --
 1 file changed, 2 deletions(-)

--- a/block/genhd.c
+++ b/block/genhd.c
@@ -445,8 +445,6 @@ int blk_alloc_devt(struct hd_struct *par
  */
 void blk_free_devt(dev_t devt)
 {
-       might_sleep();
-
        if (devt == MKDEV(0, 0))
                return;
 


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