From 8365c315507fe10925bb3281d74444fe02935b25 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <greg@kroah.com>
Date: Tue, 18 May 2004 01:49:36 -0700
Subject: [PATCH] Add msleep function to the kernel core to prevent
 duplication.

---
 include/linux/delay.h |  2 ++
 kernel/timer.c        | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/linux/delay.h b/include/linux/delay.h
index 36abaa6b19fdd..f5610919dc3e1 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -38,4 +38,6 @@ extern unsigned long loops_per_jiffy;
 #define ndelay(x)	udelay(((x)+999)/1000)
 #endif
 
+void msleep(unsigned int msecs);
+
 #endif /* defined(_LINUX_DELAY_H) */
diff --git a/kernel/timer.c b/kernel/timer.c
index d28aecec0be12..0f2d571dff3a1 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1485,3 +1485,20 @@ unregister_time_interpolator(struct time_interpolator *ti)
 	spin_unlock(&time_interpolator_lock);
 }
 #endif /* CONFIG_TIME_INTERPOLATION */
+
+/**
+ * msleep - sleep safely even with waitqueue interruptions
+ * @msecs: Time in milliseconds to sleep for
+ */
+void msleep(unsigned int msecs)
+{
+	unsigned long timeout = msecs_to_jiffies(msecs);
+
+	while (timeout) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		timeout = schedule_timeout(timeout);
+	}
+}
+
+EXPORT_SYMBOL(msleep);
+
-- 
2.53.0