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| author |   Roger Pau Monne <roger.pau@citrix.com> | 2012-12-04 15:21:53 +0100 |
|---|---|---|
| committer |   Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-12-17 21:55:56 -0500 |
| commit | ebb351cf78ee6bf3262e6b4b6906f456c05e6d5e (patch) | |
| tree | 103c6133d51f266b16c8b6f71fddf4992c57dc8f /include/linux/llist.h | |
| parent | xen-blkback: implement safe iterator for the list of persistent grants (diff) | |
| download | linux-dev-ebb351cf78ee6bf3262e6b4b6906f456c05e6d5e.tar.xz linux-dev-ebb351cf78ee6bf3262e6b4b6906f456c05e6d5e.zip | |
llist/xen-blkfront: implement safe version of llist_for_each_entry
Implement a safe version of llist_for_each_entry, and use it in
blkif_free. Previously grants where freed while iterating the list,
which lead to dereferences when trying to fetch the next item.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
[v2: Move the llist_for_each_entry_safe in llist.h]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'include/linux/llist.h')
| -rw-r--r-- | include/linux/llist.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/llist.h b/include/linux/llist.h index a5199f6d0e82..d0ab98f73d38 100644 --- a/include/linux/llist.h +++ b/include/linux/llist.h @@ -125,6 +125,31 @@ static inline void init_llist_head(struct llist_head *list) (pos) = llist_entry((pos)->member.next, typeof(*(pos)), member)) /** + * llist_for_each_entry_safe - iterate safely against remove over some entries + * of lock-less list of given type. + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as a temporary storage. + * @node: the fist entry of deleted list entries. + * @member: the name of the llist_node with the struct. + * + * In general, some entries of the lock-less list can be traversed + * safely only after being removed from list, so start with an entry + * instead of list head. This variant allows removal of entries + * as we iterate. + * + * If being used on entries deleted from lock-less list directly, the + * traverse order is from the newest to the oldest added entry. If + * you want to traverse from the oldest to the newest, you must + * reverse the order by yourself before traversing. + */ +#define llist_for_each_entry_safe(pos, n, node, member) \ + for ((pos) = llist_entry((node), typeof(*(pos)), member), \ + (n) = (pos)->member.next; \ + &(pos)->member != NULL; \ + (pos) = llist_entry(n, typeof(*(pos)), member), \ + (n) = (&(pos)->member != NULL) ? (pos)->member.next : NULL) + +/** * llist_empty - tests whether a lock-less list is empty * @head: the list to test * |