diff options
Diffstat (limited to 'drivers/net/ipa/gsi_private.h')
| -rw-r--r-- | drivers/net/ipa/gsi_private.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/net/ipa/gsi_private.h b/drivers/net/ipa/gsi_private.h index 0b2516fa21b5..51bbc7a40dc2 100644 --- a/drivers/net/ipa/gsi_private.h +++ b/drivers/net/ipa/gsi_private.h @@ -17,6 +17,20 @@ struct gsi_channel; #define GSI_RING_ELEMENT_SIZE 16 /* bytes; must be a power of 2 */ /** + * list_last_entry_or_null - get the last 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_head within the struct. + * + * Note that if the list is empty, it returns NULL. + */ +#define list_last_entry_or_null(ptr, type, member) ({ \ + struct list_head *head__ = (ptr); \ + struct list_head *pos__ = READ_ONCE(head__->prev); \ + pos__ != head__ ? list_entry(pos__, type, member) : NULL; \ +}) + +/** * gsi_trans_move_complete() - Mark a GSI transaction completed * @trans: Transaction to commit */ |