linux-kernel - [PATCH v2 1/2] cxgb4: sched: Use refcount

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Message-Id: <20190802083541.12602-1-hslester96@gmail.com>
Date:   Fri,  2 Aug 2019 16:35:41 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Vishal Kulkarni <vishal@...lsio.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH v2 1/2] cxgb4: sched: Use refcount_t for refcount

refcount_t is better for reference counters since its
implementation can prevent overflows.
So convert atomic_t ref counters to refcount_t.

Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
Changes in v2:
  - Convert refcount from 0-base to 1-base.

 drivers/net/ethernet/chelsio/cxgb4/sched.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.c b/drivers/net/ethernet/chelsio/cxgb4/sched.c
index 60218dc676a8..0d902d125be4 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sched.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sched.c
@@ -173,7 +173,7 @@ static int t4_sched_queue_unbind(struct port_info *pi, struct ch_sched_queue *p)
 
 		list_del(&qe->list);
 		kvfree(qe);
-		if (atomic_dec_and_test(&e->refcnt)) {
+		if (refcount_dec_and_test(&e->refcnt)) {
 			e->state = SCHED_STATE_UNUSED;
 			memset(&e->info, 0, sizeof(e->info));
 		}
@@ -216,7 +216,7 @@ static int t4_sched_queue_bind(struct port_info *pi, struct ch_sched_queue *p)
 		goto out_err;
 
 	list_add_tail(&qe->list, &e->queue_list);
-	atomic_inc(&e->refcnt);
+	refcount_inc(&e->refcnt);
 	return err;
 
 out_err:
@@ -434,7 +434,7 @@ static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
 		if (err)
 			return NULL;
 		memcpy(&e->info, &np, sizeof(e->info));
-		atomic_set(&e->refcnt, 0);
+		refcount_set(&e->refcnt, 1);
 		e->state = SCHED_STATE_ACTIVE;
 	}
 
@@ -488,7 +488,7 @@ struct sched_table *t4_init_sched(unsigned int sched_size)
 		s->tab[i].idx = i;
 		s->tab[i].state = SCHED_STATE_UNUSED;
 		INIT_LIST_HEAD(&s->tab[i].queue_list);
-		atomic_set(&s->tab[i].refcnt, 0);
+		refcount_set(&s->tab[i].refcnt, 1);
 	}
 	return s;
 }
-- 
2.20.1