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| author | Ricardo B. Marliere <ricardo@marliere.net> | 2024-03-08 15:12:47 +0300 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-05-09 00:29:19 +0300 |
| commit | af3b39b4c64198a08271485c6c2214ff637c3cbd (patch) | |
| tree | 51db6141856eeaf442dc2d64a45ff6abe1e79bc1 | |
| parent | 2f724563fcd76166b9922c506078a4afa4e3a90a (diff) | |
| download | linux-af3b39b4c64198a08271485c6c2214ff637c3cbd.tar.xz | |
bcachefs: chardev: make bch_chardev_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 bch_chardev_class structure to be declared at build
time placing it into read-only memory, instead of having to be dynamically
allocated at boot time. Also, correctly clean up after failing paths in
bch2_chardev_init().
Cc: Hongbo Li <lihongbo22@huawei.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
| -rw-r--r-- | fs/bcachefs/chardev.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/fs/bcachefs/chardev.c b/fs/bcachefs/chardev.c index 4d14f19f5185..dbcd433db004 100644 --- a/fs/bcachefs/chardev.c +++ b/fs/bcachefs/chardev.c @@ -961,7 +961,9 @@ static const struct file_operations bch_chardev_fops = { }; static int bch_chardev_major; -static struct class *bch_chardev_class; +static const struct class bch_chardev_class = { + .name = "bcachefs", +}; static struct device *bch_chardev; void bch2_fs_chardev_exit(struct bch_fs *c) @@ -978,7 +980,7 @@ int bch2_fs_chardev_init(struct bch_fs *c) if (c->minor < 0) return c->minor; - c->chardev = device_create(bch_chardev_class, NULL, + c->chardev = device_create(&bch_chardev_class, NULL, MKDEV(bch_chardev_major, c->minor), c, "bcachefs%u-ctl", c->minor); if (IS_ERR(c->chardev)) @@ -989,32 +991,39 @@ int bch2_fs_chardev_init(struct bch_fs *c) void bch2_chardev_exit(void) { - if (!IS_ERR_OR_NULL(bch_chardev_class)) - device_destroy(bch_chardev_class, - MKDEV(bch_chardev_major, U8_MAX)); - if (!IS_ERR_OR_NULL(bch_chardev_class)) - class_destroy(bch_chardev_class); + device_destroy(&bch_chardev_class, MKDEV(bch_chardev_major, U8_MAX)); + class_unregister(&bch_chardev_class); if (bch_chardev_major > 0) unregister_chrdev(bch_chardev_major, "bcachefs"); } int __init bch2_chardev_init(void) { + int ret; + bch_chardev_major = register_chrdev(0, "bcachefs-ctl", &bch_chardev_fops); if (bch_chardev_major < 0) return bch_chardev_major; - bch_chardev_class = class_create("bcachefs"); - if (IS_ERR(bch_chardev_class)) - return PTR_ERR(bch_chardev_class); + ret = class_register(&bch_chardev_class); + if (ret) + goto major_out; - bch_chardev = device_create(bch_chardev_class, NULL, + bch_chardev = device_create(&bch_chardev_class, NULL, MKDEV(bch_chardev_major, U8_MAX), NULL, "bcachefs-ctl"); - if (IS_ERR(bch_chardev)) - return PTR_ERR(bch_chardev); + if (IS_ERR(bch_chardev)) { + ret = PTR_ERR(bch_chardev); + goto class_out; + } return 0; + +class_out: + class_unregister(&bch_chardev_class); +major_out: + unregister_chrdev(bch_chardev_major, "bcachefs-ctl"); + return ret; } #endif /* NO_BCACHEFS_CHARDEV */ |