linux-kernel - [PATCH] qib: qib_qp: Replace rcu_assign_pointer() with RCU_INIT

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Date:	Tue, 26 Aug 2014 17:33:22 +0300
From:	Andreea-Cristina Bernat <bernat.ada@...il.com>
To:	infinipath@...el.com, roland@...nel.org, sean.hefty@...el.com,
	hal.rosenstock@...il.com, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	paulmck@...ux.vnet.ibm.com
Subject: [PATCH] qib: qib_qp: Replace rcu_assign_pointer() with
 RCU_INIT_POINTER()

According to RCU_INIT_POINTER()'s block comment 3.a, it can be used if
"3.   The referenced data structure has already been exposed to readers either
at compile time or via rcu_assign_pointer() -and-
 a.   You have not made -any- reader-visible changes to this structure since
then".

This case fulfills the conditions above because between the
rcu_dereference_protected() call and the rcu_assign_pointer() call there is no
update of that value.
Therefore, this patch makes the replacement.

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

- rcu_assign_pointer
+ RCU_INIT_POINTER
  (...,
(
 rtnl_dereference(...)
|
 rcu_dereference_protected(...)
) )

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
---
 drivers/infiniband/hw/qib/qib_qp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/qib/qib_qp.c b/drivers/infiniband/hw/qib/qib_qp.c
index 17daf42..cb0c680 100644
--- a/drivers/infiniband/hw/qib/qib_qp.c
+++ b/drivers/infiniband/hw/qib/qib_qp.c
@@ -269,7 +269,7 @@ static void remove_qp(struct qib_ibdev *dev, struct qib_qp *qp)
 				lockdep_is_held(&dev->qpt_lock))) != NULL;
 				qpp = &q->next)
 			if (q == qp) {
-				rcu_assign_pointer(*qpp,
+				RCU_INIT_POINTER(*qpp,
 					rcu_dereference_protected(qp->next,
 					 lockdep_is_held(&dev->qpt_lock)));
 				removed = 1;
-- 
1.9.1

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