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

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Message-Id: <20190802080529.11168-1-hslester96@gmail.com>
Date:   Fri,  2 Aug 2019 16:05:29 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Michael Chan <michael.chan@...adcom.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] bnxt_en: 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/broadcom/bnxt/bnxt_ulp.c | 8 ++++----
 drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
index fc77caf0a076..742a8ed200cb 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
@@ -49,7 +49,7 @@ static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id,
 			return -ENOMEM;
 	}
 
-	atomic_set(&ulp->ref_count, 0);
+	refcount_set(&ulp->ref_count, 1);
 	ulp->handle = handle;
 	rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
 
@@ -87,7 +87,7 @@ static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id)
 	synchronize_rcu();
 	ulp->max_async_event_id = 0;
 	ulp->async_events_bmap = NULL;
-	while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
+	while (refcount_read(&ulp->ref_count) != 1 && i < 10) {
 		msleep(100);
 		i++;
 	}
@@ -246,12 +246,12 @@ static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 
 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 {
-	atomic_inc(&ulp->ref_count);
+	refcount_inc(&ulp->ref_count);
 }
 
 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 {
-	atomic_dec(&ulp->ref_count);
+	refcount_dec(&ulp->ref_count);
 }
 
 void bnxt_ulp_stop(struct bnxt *bp)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
index cd78453d0bf0..fc4aa582d190 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
@@ -52,7 +52,7 @@ struct bnxt_ulp {
 	u16		max_async_event_id;
 	u16		msix_requested;
 	u16		msix_base;
-	atomic_t	ref_count;
+	refcount_t	ref_count;
 };
 
 struct bnxt_en_dev {
-- 
2.20.1