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list: add list_first_entry_or_null() 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-01-09 10:59:16 +01:00
parent d95f27aaa8
commit f1025bbf32
1 changed files with 11 additions and 0 deletions
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11
include/linux/list.h
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@ -291,6 +291,17 @@ static inline void list_splice_init(struct list_head *list,
#define list_last_entry(head, type, member) \
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.