linux-kernel - [PATCH 1/2] tty: vt: make vtconsole

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Date:   Thu,  5 Oct 2023 15:33:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-serial@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Subject: [PATCH 1/2] tty: vt: make vtconsole_class constant

Now that the driver core allows for struct class to be in read-only
memory, making all 'class' structures to be declared at build time
placing them into read-only memory, instead of having to be dynamically
allocated at load time.

Cc: Jiri Slaby <jirislaby@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/vt/vt.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 5c47f77804f0..7659b92db631 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3565,7 +3565,9 @@ int __init vty_init(const struct file_operations *console_fops)
 	return 0;
 }
 
-static struct class *vtconsole_class;
+static const struct class vtconsole_class = {
+	.name = "vtconsole",
+};
 
 static int do_bind_con_driver(const struct consw *csw, int first, int last,
 			   int deflt)
@@ -4092,7 +4094,7 @@ static int do_register_con_driver(const struct consw *csw, int first, int last)
 		goto err;
 
 	con_driver->dev =
-		device_create_with_groups(vtconsole_class, NULL,
+		device_create_with_groups(&vtconsole_class, NULL,
 					  MKDEV(0, con_driver->node),
 					  con_driver, con_dev_groups,
 					  "vtcon%i", con_driver->node);
@@ -4173,7 +4175,7 @@ static void con_driver_unregister_callback(struct work_struct *ignored)
 		console_unlock();
 
 		vtconsole_deinit_device(con_driver);
-		device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
+		device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
 
 		console_lock();
 
@@ -4234,12 +4236,9 @@ static int __init vtconsole_class_init(void)
 {
 	int i;
 
-	vtconsole_class = class_create("vtconsole");
-	if (IS_ERR(vtconsole_class)) {
-		pr_warn("Unable to create vt console class; errno = %ld\n",
-			PTR_ERR(vtconsole_class));
-		vtconsole_class = NULL;
-	}
+	i = class_register(&vtconsole_class);
+	if (i)
+		pr_warn("Unable to create vt console class; errno = %d\n", i);
 
 	/* Add system drivers to sysfs */
 	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
@@ -4247,7 +4246,7 @@ static int __init vtconsole_class_init(void)
 
 		if (con->con && !con->dev) {
 			con->dev =
-				device_create_with_groups(vtconsole_class, NULL,
+				device_create_with_groups(&vtconsole_class, NULL,
 							  MKDEV(0, con->node),
 							  con, con_dev_groups,
 							  "vtcon%i", con->node);
-- 
2.42.0