X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=kernel%2Fkthread.c;h=c5f3c6613b6d77dd21d6a0bfcedfbe44d624f802;hb=cf017e1b6f625978288e2cd8ede04f8185b97c08;hp=e75950a1092c6b2063ea24a1f196f987e7f21bf5;hpb=2ecc26b87a2b3e8650d3c7fe3fc85a8c73d5560d;p=powerpc.git

diff --git a/kernel/kthread.c b/kernel/kthread.c
index e75950a109..c5f3c6613b 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;
 }