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dlm: remove usage of list iterator for list_add() after the loop body

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In preparation to limit the scope of a list iterator to the list
traversal loop, use a dedicated pointer to point to the found element [1].

Before, the code implicitly used the head when no element was found
when using &pos->list. Since the new variable is only set if an
element was found, the list_add() is performed within the loop
and only done after the loop if it is done on the list head directly.

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Jakob Koschel 2022-04-06 14:05:30 -04:00 committed by David Teigland
parent ba58995909
commit c490b3afaa
1 changed files with 8 additions and 4 deletions
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12
fs/dlm/lock.c
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@ -1321,13 +1321,17 @@ static inline void unhold_lkb(struct dlm_lkb *lkb)
static void lkb_add_ordered(struct list_head *new, struct list_head *head,
int mode)
{
struct dlm_lkb *lkb = NULL;
struct dlm_lkb *lkb = NULL, *iter;
list_for_each_entry(lkb, head, lkb_statequeue)
if (lkb->lkb_rqmode < mode)
list_for_each_entry(iter, head, lkb_statequeue)
if (iter->lkb_rqmode < mode) {
lkb = iter;
list_add_tail(new, &iter->lkb_statequeue);
break;
}
__list_add(new, lkb->lkb_statequeue.prev, &lkb->lkb_statequeue);
if (!lkb)
list_add_tail(new, head);
}
/* add/remove lkb to rsb's grant/convert/wait queue */