IB/qib: Replace rcu_assign_pointer() with RCU_INIT_POINTER() in qib_keys.c

The uses of "rcu_assign_pointer()" are NULLing out the pointers.
According to RCU_INIT_POINTER()'s block comment:
"1.   This use of RCU_INIT_POINTER() is NULLing out the pointer"
it is better to use it instead of rcu_assign_pointer() because it has a
smaller overhead.

The following Coccinelle semantic patch was used:
@@
@@

- rcu_assign_pointer
+ RCU_INIT_POINTER
  (..., NULL)

[Derived from http://marc.info/?l=linux-rdma&m=140836519219236&w=2]

Tested-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Andreea-Cristina Bernat <bernat.ada@gmail.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/hw/qib/qib_keys.c b/drivers/infiniband/hw/qib/qib_keys.c
index 3b9afccaaade824370f5c0ea0d6d6ceb519e6090..ad843c786e7212d0c89f90264bacb5cb6b8346a0 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_keys.c
+++ b/drivers/infiniband/hw/qib/qib_keys.c
@@ -122,10 +122,10 @@ void qib_free_lkey(struct qib_mregion *mr)
        if (!mr->lkey_published)
                goto out;
        if (lkey == 0)
-               rcu_assign_pointer(dev->dma_mr, NULL);
+               RCU_INIT_POINTER(dev->dma_mr, NULL);
        else {
                r = lkey >> (32 - ib_qib_lkey_table_size);
-               rcu_assign_pointer(rkt->table[r], NULL);
+               RCU_INIT_POINTER(rkt->table[r], NULL);
        }
        qib_put_mr(mr);
        mr->lkey_published = 0;