linux-kernel - [PATCH] mfd: dln2: Switch to kvfree

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Message-Id: <20211215111845.2514-5-urezki@gmail.com>
Date:   Wed, 15 Dec 2021 12:18:41 +0100
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Cc:     Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: [PATCH] mfd: dln2: Switch to kvfree_rcu() API

Instead of invoking a synchronize_rcu() to free a pointer
after a grace period we can directly make use of new API
that does the same but in more efficient way.

TO: Lee Jones <lee.jones@...aro.org>
TO: Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 drivers/mfd/dln2.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
index 852129ea0766..365e3e77cac4 100644
--- a/drivers/mfd/dln2.c
+++ b/drivers/mfd/dln2.c
@@ -179,10 +179,8 @@ void dln2_unregister_event_cb(struct platform_device *pdev, u16 id)
 
 	spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
 
-	if (found) {
-		synchronize_rcu();
-		kfree(i);
-	}
+	if (found)
+		kvfree_rcu(i);
 }
 EXPORT_SYMBOL(dln2_unregister_event_cb);
 
-- 
2.30.2