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Diffstat (limited to 'ipc/sem.c')
-rw-r--r--ipc/sem.c38
1 files changed, 13 insertions, 25 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index 084e1f55ca72..4f5af6e7d630 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -813,8 +813,7 @@ static inline int check_restart(struct sem_array *sma, struct sem_queue *q)
static int wake_const_ops(struct sem_array *sma, int semnum,
struct wake_q_head *wake_q)
{
- struct sem_queue *q;
- struct list_head *walk;
+ struct sem_queue *q, *tmp;
struct list_head *pending_list;
int semop_completed = 0;
@@ -823,25 +822,19 @@ static int wake_const_ops(struct sem_array *sma, int semnum,
else
pending_list = &sma->sem_base[semnum].pending_const;
- walk = pending_list->next;
- while (walk != pending_list) {
- int error;
-
- q = container_of(walk, struct sem_queue, list);
- walk = walk->next;
-
- error = perform_atomic_semop(sma, q);
-
- if (error <= 0) {
- /* operation completed, remove from queue & wakeup */
+ list_for_each_entry_safe(q, tmp, pending_list, list) {
+ int error = perform_atomic_semop(sma, q);
- unlink_queue(sma, q);
+ if (error > 0)
+ continue;
+ /* operation completed, remove from queue & wakeup */
+ unlink_queue(sma, q);
- wake_up_sem_queue_prepare(q, error, wake_q);
- if (error == 0)
- semop_completed = 1;
- }
+ wake_up_sem_queue_prepare(q, error, wake_q);
+ if (error == 0)
+ semop_completed = 1;
}
+
return semop_completed;
}
@@ -914,8 +907,7 @@ static int do_smart_wakeup_zero(struct sem_array *sma, struct sembuf *sops,
*/
static int update_queue(struct sem_array *sma, int semnum, struct wake_q_head *wake_q)
{
- struct sem_queue *q;
- struct list_head *walk;
+ struct sem_queue *q, *tmp;
struct list_head *pending_list;
int semop_completed = 0;
@@ -925,13 +917,9 @@ static int update_queue(struct sem_array *sma, int semnum, struct wake_q_head *w
pending_list = &sma->sem_base[semnum].pending_alter;
again:
- walk = pending_list->next;
- while (walk != pending_list) {
+ list_for_each_entry_safe(q, tmp, pending_list, list) {
int error, restart;
- q = container_of(walk, struct sem_queue, list);
- walk = walk->next;
-
/* If we are scanning the single sop, per-semaphore list of
* one semaphore and that semaphore is 0, then it is not
* necessary to scan further: simple increments