netdev - [PATCH net-next 4/6] net: wwan: hwsim: make wwan_hwsim

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Message-Id: <20240302-class_cleanup-net-next-v1-4-8fa378595b93@marliere.net>
Date: Sat, 02 Mar 2024 14:06:00 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Yisen Zhuang <yisen.zhuang@...wei.com>, 
 Salil Mehta <salil.mehta@...wei.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Loic Poulain <loic.poulain@...aro.org>, 
 Sergey Ryazanov <ryazanov.s.a@...il.com>, 
 Johannes Berg <johannes@...solutions.net>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-ppp@...r.kernel.org, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH net-next 4/6] net: wwan: hwsim: make wwan_hwsim_class
 constant

Since commit 43a7206b0963 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the wwan_hwsim_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 drivers/net/wwan/wwan_hwsim.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wwan/wwan_hwsim.c b/drivers/net/wwan/wwan_hwsim.c
index ff3dd24ddb33..b02befd1b6fb 100644
--- a/drivers/net/wwan/wwan_hwsim.c
+++ b/drivers/net/wwan/wwan_hwsim.c
@@ -25,7 +25,9 @@ static int wwan_hwsim_devsnum = 2;
 module_param_named(devices, wwan_hwsim_devsnum, int, 0444);
 MODULE_PARM_DESC(devices, "Number of simulated devices");

-static struct class *wwan_hwsim_class;
+static const struct class wwan_hwsim_class = {
+	.name = "wwan_hwsim",
+};

 static struct dentry *wwan_hwsim_debugfs_topdir;
 static struct dentry *wwan_hwsim_debugfs_devcreate;
@@ -277,7 +279,7 @@ static struct wwan_hwsim_dev *wwan_hwsim_dev_new(void)
 	spin_unlock(&wwan_hwsim_devs_lock);

 	dev->dev.release = wwan_hwsim_dev_release;
-	dev->dev.class = wwan_hwsim_class;
+	dev->dev.class = &wwan_hwsim_class;
 	dev_set_name(&dev->dev, "hwsim%u", dev->id);

 	spin_lock_init(&dev->ports_lock);
@@ -511,11 +513,9 @@ static int __init wwan_hwsim_init(void)
 	if (!wwan_wq)
 		return -ENOMEM;

-	wwan_hwsim_class = class_create("wwan_hwsim");
-	if (IS_ERR(wwan_hwsim_class)) {
-		err = PTR_ERR(wwan_hwsim_class);
+	err = class_register(&wwan_hwsim_class);
+	if (err)
 		goto err_wq_destroy;
-	}

 	wwan_hwsim_debugfs_topdir = debugfs_create_dir("wwan_hwsim", NULL);
 	wwan_hwsim_debugfs_devcreate =
@@ -534,7 +534,7 @@ static int __init wwan_hwsim_init(void)
 	wwan_hwsim_free_devs();
 	flush_workqueue(wwan_wq);	/* Wait deletion works completion */
 	debugfs_remove(wwan_hwsim_debugfs_topdir);
-	class_destroy(wwan_hwsim_class);
+	class_unregister(&wwan_hwsim_class);
 err_wq_destroy:
 	destroy_workqueue(wwan_wq);

@@ -547,7 +547,7 @@ static void __exit wwan_hwsim_exit(void)
 	wwan_hwsim_free_devs();
 	flush_workqueue(wwan_wq);	/* Wait deletion works completion */
 	debugfs_remove(wwan_hwsim_debugfs_topdir);
-	class_destroy(wwan_hwsim_class);
+	class_unregister(&wwan_hwsim_class);
 	destroy_workqueue(wwan_wq);
 }

-- 
2.43.0