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vfio/mbochs: make mbochs_class constant 

Since commit 43a7206b09 ("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 mbochs_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@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Link: https://lore.kernel.org/r/20240301-class_cleanup-vfio-v1-2-9236d69083f5@marliere.net
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Ricardo B. Marliere 2024-03-01 14:51:48 -03:00 committed by Alex Williamson
parent 1f92d6a7c6
commit 626f534d77
1 changed files with 8 additions and 10 deletions
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18
samples/vfio-mdev/mbochs.c
View File

@ -133,7 +133,9 @@ static struct mdev_type *mbochs_mdev_types[] = {
};
static dev_t mbochs_devt;
static struct class *mbochs_class;
static const struct class mbochs_class = {
.name = MBOCHS_CLASS_NAME,
};
static struct cdev mbochs_cdev;
static struct device mbochs_dev;
static struct mdev_parent mbochs_parent;
@ -1422,13 +1424,10 @@ static int __init mbochs_dev_init(void)
if (ret)
goto err_cdev;
mbochs_class = class_create(MBOCHS_CLASS_NAME);
if (IS_ERR(mbochs_class)) {
pr_err("Error: failed to register mbochs_dev class\n");
ret = PTR_ERR(mbochs_class);
ret = class_register(&mbochs_class);
if (ret)
goto err_driver;
}
mbochs_dev.class = mbochs_class;
mbochs_dev.class = &mbochs_class;
mbochs_dev.release = mbochs_device_release;
dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
@ -1448,7 +1447,7 @@ err_device:
device_del(&mbochs_dev);
err_put:
put_device(&mbochs_dev);
class_destroy(mbochs_class);
class_unregister(&mbochs_class);
err_driver:
mdev_unregister_driver(&mbochs_driver);
err_cdev:
@ -1466,8 +1465,7 @@ static void __exit mbochs_dev_exit(void)
mdev_unregister_driver(&mbochs_driver);
cdev_del(&mbochs_cdev);
unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
class_destroy(mbochs_class);
mbochs_class = NULL;
class_unregister(&mbochs_class);
}
MODULE_IMPORT_NS(DMA_BUF);