diff options
Diffstat (limited to 'include/linux/cleanup.h')
| -rw-r--r-- | include/linux/cleanup.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/cleanup.h b/include/linux/cleanup.h index 7e57047e1564..7093e1d08af0 100644 --- a/include/linux/cleanup.h +++ b/include/linux/cleanup.h @@ -216,6 +216,25 @@ const volatile void * __must_check_fn(const volatile void *val) #define return_ptr(p) return no_free_ptr(p) +/* + * Only for situations where an allocation is handed in to another function + * and consumed by that function on success. + * + * struct foo *f __free(kfree) = kzalloc(sizeof(*f), GFP_KERNEL); + * + * setup(f); + * if (some_condition) + * return -EINVAL; + * .... + * ret = bar(f); + * if (!ret) + * retain_and_null_ptr(f); + * return ret; + * + * After retain_and_null_ptr(f) the variable f is NULL and cannot be + * dereferenced anymore. + */ +#define retain_and_null_ptr(p) ((void)__get_and_null(p, NULL)) /* * DEFINE_CLASS(name, type, exit, init, init_args...): |