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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2014-01-09 10:59:16 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-01-10 11:52:04 +0100 |
| commit | f1025bbf3292c8c199e23e618c062ec1e9f2f055 (patch) | |
| tree | be485f9dbcd653b38317640e1516e66033f86ae6 /include | |
| parent | d95f27aaa83381ce210d3b285ad2647ce0313bbb (diff) | |
| download | barebox-f1025bbf3292c8c199e23e618c062ec1e9f2f055.tar.gz barebox-f1025bbf3292c8c199e23e618c062ec1e9f2f055.tar.xz | |
list: add list_first_entry_or_null()
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/list.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h index 5ae90b43a3..bc63ece95d 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -292,6 +292,17 @@ static inline void list_splice_init(struct list_head *list, list_entry((head)->prev, type, member) /** + * list_first_entry_or_null - get the first element from a list + * @ptr: the list head to take the element from. + * @type: the type of the struct this is embedded in. + * @member: the name of the list_struct within the struct. + * + * Note that if the list is empty, it returns NULL. + */ +#define list_first_entry_or_null(ptr, type, member) \ + (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL) + +/** * list_for_each - iterate over a list * @pos: the &struct list_head to use as a loop cursor. * @head: the head for your list. |