From 1f92d6a7c65f390617463532b408030a5a168097 Mon Sep 17 00:00:00 2001 From: "Ricardo B. Marliere" Date: Fri, 1 Mar 2024 14:51:47 -0300 Subject: vfio/mdpy: make mdpy_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 mdpy_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 Suggested-by: Greg Kroah-Hartman Signed-off-by: Ricardo B. Marliere Link: https://lore.kernel.org/r/20240301-class_cleanup-vfio-v1-1-9236d69083f5@marliere.net Signed-off-by: Alex Williamson --- samples/vfio-mdev/mdpy.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c index 72ea5832c927..27795501de6e 100644 --- a/samples/vfio-mdev/mdpy.c +++ b/samples/vfio-mdev/mdpy.c @@ -84,7 +84,9 @@ static struct mdev_type *mdpy_mdev_types[] = { }; static dev_t mdpy_devt; -static struct class *mdpy_class; +static const struct class mdpy_class = { + .name = MDPY_CLASS_NAME, +}; static struct cdev mdpy_cdev; static struct device mdpy_dev; static struct mdev_parent mdpy_parent; @@ -709,13 +711,10 @@ static int __init mdpy_dev_init(void) if (ret) goto err_cdev; - mdpy_class = class_create(MDPY_CLASS_NAME); - if (IS_ERR(mdpy_class)) { - pr_err("Error: failed to register mdpy_dev class\n"); - ret = PTR_ERR(mdpy_class); + ret = class_register(&mdpy_class); + if (ret) goto err_driver; - } - mdpy_dev.class = mdpy_class; + mdpy_dev.class = &mdpy_class; mdpy_dev.release = mdpy_device_release; dev_set_name(&mdpy_dev, "%s", MDPY_NAME); @@ -735,7 +734,7 @@ err_device: device_del(&mdpy_dev); err_put: put_device(&mdpy_dev); - class_destroy(mdpy_class); + class_unregister(&mdpy_class); err_driver: mdev_unregister_driver(&mdpy_driver); err_cdev: @@ -753,8 +752,7 @@ static void __exit mdpy_dev_exit(void) mdev_unregister_driver(&mdpy_driver); cdev_del(&mdpy_cdev); unregister_chrdev_region(mdpy_devt, MINORMASK + 1); - class_destroy(mdpy_class); - mdpy_class = NULL; + class_unregister(&mdpy_class); } module_param_named(count, mdpy_driver.max_instances, int, 0444); -- cgit v1.2.3