Re: [PATCH net-next 1/6] net: hns: make hnae_class constant

Simon Horman
2024-03-04T17:52:21Z

+ Benjamin Tissoires <benjamin.tissoires@redhat.com>

On Sat, Mar 02, 2024 at 02:05:57PM -0300, Ricardo B. Marliere wrote:
> 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 hnae_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>

Reviewed-by: Simon Horman <horms@kernel.org>

> ---
> drivers/net/ethernet/hisilicon/hns/hnae.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns/hnae.c b/drivers/net/ethernet/hisilicon/hns/hnae.c
> index 8a1027ad340d..d4293f76d69d 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hnae.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hnae.c
> @@ -12,7 +12,9 @@
>
> #define cls_to_ae_dev(dev) container_of(dev, struct hnae_ae_dev, cls_dev)
>
> -static struct class *hnae_class;
> +static const struct class hnae_class = {
> + .name = "hnae",
> +};
>
> static void
> hnae_list_add(spinlock_t *lock, struct list_head *node, struct list_head *head)
> @@ -111,7 +113,7 @@ static struct hnae_ae_dev *find_ae(const struct fwnode_handle *fwnode)
>
> WARN_ON(!fwnode);
>
> - dev = class_find_device(hnae_class, NULL, fwnode, __ae_match);
> + dev = class_find_device(&hnae_class, NULL, fwnode, __ae_match);
>
> return dev ? cls_to_ae_dev(dev) : NULL;
> }
> @@ -415,7 +417,7 @@ int hnae_ae_register(struct hnae_ae_dev *hdev, struct module *owner)
> hdev->owner = owner;
> hdev->id = (int)atomic_inc_return(&id);
> hdev->cls_dev.parent = hdev->dev;
> - hdev->cls_dev.class = hnae_class;
> + hdev->cls_dev.class = &hnae_class;
> hdev->cls_dev.release = hnae_release;
> (void)dev_set_name(&hdev->cls_dev, "hnae%d", hdev->id);
> ret = device_register(&hdev->cls_dev);
> @@ -448,13 +450,12 @@ EXPORT_SYMBOL(hnae_ae_unregister);
>
> static int __init hnae_init(void)
> {
> - hnae_class = class_create("hnae");
> - return PTR_ERR_OR_ZERO(hnae_class);
> + return class_register(&hnae_class);
> }
>
> static void __exit hnae_exit(void)
> {
> - class_destroy(hnae_class);
> + class_unregister(&hnae_class);
> }
>
> subsys_initcall(hnae_init);
>
> --
> 2.43.0
>
>