From: Alan Stern <stern@rowland.harvard.edu>
Date: Sun, 30 Oct 2005 23:01:40 +0000 (-0800)
Subject: [PATCH] Add kthread_stop_sem()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=61e1a9ea4b425eb8c3b4965c35fe953bd881728f;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

[PATCH] Add kthread_stop_sem()

Enhance the kthread API by adding kthread_stop_sem, for use in stopping
threads that spend their idle time waiting on a semaphore.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 3fa786448db3..ebdd41fd1082 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -69,6 +69,18 @@ void kthread_bind(struct task_struct *k, unsigned int cpu);
  * was never called. */
 int kthread_stop(struct task_struct *k);
 
+/**
+ * kthread_stop_sem: stop a thread created by kthread_create().
+ * @k: thread created by kthread_create().
+ * @s: semaphore that @k waits on while idle.
+ *
+ * Does essentially the same thing as kthread_stop() above, but wakes
+ * @k by calling up(@s).
+ *
+ * Returns the result of threadfn(), or -EINTR if wake_up_process()
+ * was never called. */
+int kthread_stop_sem(struct task_struct *k, struct semaphore *s);
+
 /**
  * kthread_should_stop: should this kthread return now?
  *
diff --git a/kernel/kthread.c b/kernel/kthread.c
index f50f174e92da..e75950a1092c 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -164,6 +164,12 @@ void kthread_bind(struct task_struct *k, unsigned int cpu)
 EXPORT_SYMBOL(kthread_bind);
 
 int kthread_stop(struct task_struct *k)
+{
+	return kthread_stop_sem(k, NULL);
+}
+EXPORT_SYMBOL(kthread_stop);
+
+int kthread_stop_sem(struct task_struct *k, struct semaphore *s)
 {
 	int ret;
 
@@ -178,7 +184,10 @@ int kthread_stop(struct task_struct *k)
 
 	/* Now set kthread_should_stop() to true, and wake it up. */
 	kthread_stop_info.k = k;
-	wake_up_process(k);
+	if (s)
+		up(s);
+	else
+		wake_up_process(k);
 	put_task_struct(k);
 
 	/* Once it dies, reset stop ptr, gather result and we're done. */
@@ -189,7 +198,7 @@ int kthread_stop(struct task_struct *k)
 
 	return ret;
 }
-EXPORT_SYMBOL(kthread_stop);
+EXPORT_SYMBOL(kthread_stop_sem);
 
 static __init int helper_init(void)
 {