linux-kernel - [PATCH 3/3] infiniband: sw: rdmavt: mcast.c: Use built-in RCU list checking

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Message-Id: <20200107193119.22915-1-madhuparnabhowmik04@gmail.com>
Date:   Wed,  8 Jan 2020 01:01:19 +0530
From:   madhuparnabhowmik04@...il.com
To:     dennis.dalessandro@...el.com, mike.marciniszyn@...el.com,
        dledford@...hat.com, paulmck@...nel.org
Cc:     rcu@...r.kernel.org, joel@...lfernandes.org, frextrite@...il.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>
Subject: [PATCH 3/3] infiniband: sw: rdmavt: mcast.c: Use built-in RCU list checking

From: Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>

Use built-in RCU and lock-checking for list_for_each_entry_rcu()
by passing the cond argument.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>
---
 drivers/infiniband/sw/rdmavt/mcast.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/rdmavt/mcast.c b/drivers/infiniband/sw/rdmavt/mcast.c
index dd11c6fcd060..983cf6d06dfc 100644
--- a/drivers/infiniband/sw/rdmavt/mcast.c
+++ b/drivers/infiniband/sw/rdmavt/mcast.c
@@ -224,7 +224,8 @@ static int rvt_mcast_add(struct rvt_dev_info *rdi, struct rvt_ibport *ibp,
 		}
 
 		/* Search the QP list to see if this is already there. */
-		list_for_each_entry_rcu(p, &tmcast->qp_list, list) {
+		list_for_each_entry_rcu(p, &tmcast->qp_list, list,
+					lock_is_held(&(ibp->lock).dep_map)) {
 			if (p->qp == mqp->qp) {
 				ret = ESRCH;
 				goto bail;
-- 
2.17.1