1 files changed, 52 insertions, 5 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 257002c13bb0..d6fdcdcbb9b1 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3267,7 +3267,8 @@ void complete_all(struct completion *x)
 EXPORT_SYMBOL(complete_all);
 
 static inline long __sched
-do_wait_for_common(struct completion *x, long timeout, int state)
+do_wait_for_common(struct completion *x,
+                   long (*action)(long), long timeout, int state)
 {
         if (!x->done) {
                 DECLARE_WAITQUEUE(wait, current);
@@ -3280,7 +3281,7 @@ do_wait_for_common(struct completion *x, long timeout, int state)
                         }
                         __set_current_state(state);
                         spin_unlock_irq(&x->wait.lock);
-                        timeout = schedule_timeout(timeout);
+                        timeout = action(timeout);
                         spin_lock_irq(&x->wait.lock);
                 } while (!x->done && timeout);
                 __remove_wait_queue(&x->wait, &wait);
@@ -3291,17 +3292,30 @@ do_wait_for_common(struct completion *x, long timeout, int state)
         return timeout ?: 1;
 }
 
-static long __sched
-wait_for_common(struct completion *x, long timeout, int state)
+static inline long __sched
+__wait_for_common(struct completion *x,
+                  long (*action)(long), long timeout, int state)
 {
         might_sleep();
 
         spin_lock_irq(&x->wait.lock);
-        timeout = do_wait_for_common(x, timeout, state);
+        timeout = do_wait_for_common(x, action, timeout, state);
         spin_unlock_irq(&x->wait.lock);
         return timeout;
 }
 
+static long __sched
+wait_for_common(struct completion *x, long timeout, int state)
+{
+        return __wait_for_common(x, schedule_timeout, timeout, state);
+}
+
+static long __sched
+wait_for_common_io(struct completion *x, long timeout, int state)
+{
+        return __wait_for_common(x, io_schedule_timeout, timeout, state);
+}
+
 /**
  * wait_for_completion: - waits for completion of a task
  * @x:  holds the state of this particular completion
@@ -3338,6 +3352,39 @@ wait_for_completion_timeout(struct completion *x, unsigned long timeout)
 EXPORT_SYMBOL(wait_for_completion_timeout);
 
 /**
+ * wait_for_completion_io: - waits for completion of a task
+ * @x:  holds the state of this particular completion
+ *
+ * This waits to be signaled for completion of a specific task. It is NOT
+ * interruptible and there is no timeout. The caller is accounted as waiting
+ * for IO.
+ */
+void __sched wait_for_completion_io(struct completion *x)
+{
+        wait_for_common_io(x, MAX_SCHEDULE_TIMEOUT, TASK_UNINTERRUPTIBLE);
+}
+EXPORT_SYMBOL(wait_for_completion_io);
+
+/**
+ * wait_for_completion_io_timeout: - waits for completion of a task (w/timeout)
+ * @x:  holds the state of this particular completion
+ * @timeout:  timeout value in jiffies
+ *
+ * This waits for either a completion of a specific task to be signaled or for a
+ * specified timeout to expire. The timeout is in jiffies. It is not
+ * interruptible. The caller is accounted as waiting for IO.
+ *
+ * The return value is 0 if timed out, and positive (at least 1, or number of
+ * jiffies left till timeout) if completed.
+ */
+unsigned long __sched
+wait_for_completion_io_timeout(struct completion *x, unsigned long timeout)
+{
+        return wait_for_common_io(x, timeout, TASK_UNINTERRUPTIBLE);
+}
+EXPORT_SYMBOL(wait_for_completion_io_timeout);
+
+/**
  * wait_for_completion_interruptible: - waits for completion of a task (w/intr)
  * @x:  holds the state of this particular completion
  *