linux-kernel - [PATCH] scsi: core: Switch to kvfree

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Date:   Wed, 15 Dec 2021 12:18:45 +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] scsi: core: 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: James E.J. Bottomley <jejb@...ux.ibm.com>
TO: Martin K. Petersen <martin.petersen@...cle.com>
TO: linux-scsi@...r.kernel.org
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 drivers/scsi/device_handler/scsi_dh_alua.c | 3 +--
 drivers/scsi/device_handler/scsi_dh_rdac.c | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 37d06f993b76..308246ce346a 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -1238,8 +1238,7 @@ static void alua_bus_detach(struct scsi_device *sdev)
 		kref_put(&pg->kref, release_port_group);
 	}
 	sdev->handler_data = NULL;
-	synchronize_rcu();
-	kfree(h);
+	kvfree_rcu(h);
 }
 
 static struct scsi_device_handler alua_dh = {
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 66652ab409cc..dc687021ff3a 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -782,8 +782,7 @@ static void rdac_bus_detach( struct scsi_device *sdev )
 	}
 	spin_unlock(&list_lock);
 	sdev->handler_data = NULL;
-	synchronize_rcu();
-	kfree(h);
+	kvfree_rcu(h);
 }
 
 static struct scsi_device_handler rdac_dh = {
-- 
2.30.2