On Thu, Mar 23, 2023 at 12:58:30AM +0800, Yangtao Li wrote:
> There are plenty of using kobject_del() and kobject_put() together
> in the kernel tree. This patch wraps these two calls in a single helper.
>
> Signed-off-by: Yangtao Li <frank...@vivo.com>
> ---
> v3:
> -convert to inline helper
> v2:
> -add kobject_del_and_put() users
> include/linux/kobject.h | 13 +++++++++++++
> lib/kobject.c | 3 +--
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/kobject.h b/include/linux/kobject.h
> index bdab370a24f4..e21b7c22e355 100644
> --- a/include/linux/kobject.h
> +++ b/include/linux/kobject.h
> @@ -112,6 +112,19 @@ extern struct kobject * __must_check
> kobject_get_unless_zero(
> struct kobject *kobj);
> extern void kobject_put(struct kobject *kobj);
>
> +/**
> + * kobject_del_and_put() - Delete kobject.
> + * @kobj: object.
> + *
> + * Unlink kobject from hierarchy and decrement the refcount.
> + * If refcount is 0, call kobject_cleanup().
> + */
> +static inline void kobject_del_and_put(struct kobject *kobj)
> +{
> + kobject_del(kobj);
> + kobject_put(kobj);
> +}
kobject_put() actually covers kobject removal automatically, which is
single stage removal. So if you see the two called together, it is
safe to kill kobject_del() directly.
thanks,
Ming
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