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-rw-r--r--fs/eventpoll.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 205a1e1c77c7..db4365f8a75c 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -97,8 +97,8 @@ struct epoll_filefd {
*/
struct nested_call_node {
struct list_head llink;
- struct task_struct *task;
void *cookie;
+ int cpu;
};
/*
@@ -327,7 +327,7 @@ static int ep_call_nested(struct nested_calls *ncalls, int max_nests,
{
int error, call_nests = 0;
unsigned long flags;
- struct task_struct *this_task = current;
+ int this_cpu = get_cpu();
struct list_head *lsthead = &ncalls->tasks_call_list;
struct nested_call_node *tncur;
struct nested_call_node tnode;
@@ -340,20 +340,19 @@ static int ep_call_nested(struct nested_calls *ncalls, int max_nests,
* very much limited.
*/
list_for_each_entry(tncur, lsthead, llink) {
- if (tncur->task == this_task &&
+ if (tncur->cpu == this_cpu &&
(tncur->cookie == cookie || ++call_nests > max_nests)) {
/*
* Ops ... loop detected or maximum nest level reached.
* We abort this wake by breaking the cycle itself.
*/
- spin_unlock_irqrestore(&ncalls->lock, flags);
-
- return -1;
+ error = -1;
+ goto out_unlock;
}
}
/* Add the current task and cookie to the list */
- tnode.task = this_task;
+ tnode.cpu = this_cpu;
tnode.cookie = cookie;
list_add(&tnode.llink, lsthead);
@@ -365,8 +364,10 @@ static int ep_call_nested(struct nested_calls *ncalls, int max_nests,
/* Remove the current task from the list */
spin_lock_irqsave(&ncalls->lock, flags);
list_del(&tnode.llink);
+ out_unlock:
spin_unlock_irqrestore(&ncalls->lock, flags);
+ put_cpu();
return error;
}