linux-kernel - [PATCH 2/3] infiniband: hw: qib: qib_verbs: Use built-in RCU list checking

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Message-Id: <20200107173510.20320-2-madhuparnabhowmik04@gmail.com>
Date:   Tue,  7 Jan 2020 23:05:09 +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 2/3] infiniband: hw: qib: qib_verbs: 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 cond argument to it.

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

diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index 33778d451b82..4dc7514ce626 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/drivers/infiniband/hw/qib/qib_verbs.c
@@ -329,7 +329,8 @@ void qib_ib_rcv(struct qib_ctxtdata *rcd, void *rhdr, void *data, u32 tlen)
 		if (mcast == NULL)
 			goto drop;
 		this_cpu_inc(ibp->pmastats->n_multicast_rcv);
-		list_for_each_entry_rcu(p, &mcast->qp_list, list)
+		list_for_each_entry_rcu(p, &mcast->qp_list, list
+								lock_is_held(&(ibp->rvp.lock).dep_map))
 			qib_qp_rcv(rcd, hdr, 1, data, tlen, p->qp);
 		/*
 		 * Notify rvt_multicast_detach() if it is waiting for us
-- 
2.17.1