[ 21/91] IB/core: Fix mismatch between locked and pinned pages

[Greg KH]

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

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

From: Yishai Hadas <yishaih@xxxxxxxxxxxx>

commit c4870eb874ac16dccef40e1bc7a002c7e9156adc upstream.

Commit bc3e53f682d9 ("mm: distinguish between mlocked and pinned
pages") introduced a separate counter for pinned pages and used it in
the IB stack.  However, in ib_umem_get() the pinned counter is
incremented, but ib_umem_release() wrongly decrements the locked
counter.  Fix this.

Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Roland Dreier <roland@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/infiniband/core/umem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -269,7 +269,7 @@ void ib_umem_release(struct ib_umem *ume
 	} else
 		down_write(&mm->mmap_sem);
 
-	current->mm->locked_vm -= diff;
+	current->mm->pinned_vm -= diff;
 	up_write(&mm->mmap_sem);
 	mmput(mm);
 	kfree(umem);


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