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Diffstat (limited to 'kernel/kthread.c')
-rw-r--r--kernel/kthread.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index e75950a1092..c5f3c6613b6 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -12,6 +12,7 @@
#include <linux/unistd.h>
#include <linux/file.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <asm/semaphore.h>
/*
@@ -41,7 +42,7 @@ struct kthread_stop_info
/* Thread stopping is done by setthing this var: lock serializes
* multiple kthread_stop calls. */
-static DECLARE_MUTEX(kthread_stop_lock);
+static DEFINE_MUTEX(kthread_stop_lock);
static struct kthread_stop_info kthread_stop_info;
int kthread_should_stop(void)
@@ -114,7 +115,9 @@ static void keventd_create_kthread(void *_create)
create->result = ERR_PTR(pid);
} else {
wait_for_completion(&create->started);
+ read_lock(&tasklist_lock);
create->result = find_task_by_pid(pid);
+ read_unlock(&tasklist_lock);
}
complete(&create->done);
}
@@ -173,7 +176,7 @@ int kthread_stop_sem(struct task_struct *k, struct semaphore *s)
{
int ret;
- down(&kthread_stop_lock);
+ mutex_lock(&kthread_stop_lock);
/* It could exit after stop_info.k set, but before wake_up_process. */
get_task_struct(k);
@@ -194,7 +197,7 @@ int kthread_stop_sem(struct task_struct *k, struct semaphore *s)
wait_for_completion(&kthread_stop_info.done);
kthread_stop_info.k = NULL;
ret = kthread_stop_info.err;
- up(&kthread_stop_lock);
+ mutex_unlock(&kthread_stop_lock);
return ret;
}