Merge tag 'asoc-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-next

ASoC: Updates for v5.4

Quite a big update this time around, particularly in the core
where we've had a lot of cleanups from Morimoto-san - there's
not much functional change but quite a bit of modernization
going on.  We've also seen a lot of driver work, a lot of it
cleanups but also some particular drivers.

 - Lots and lots of cleanups from Morimoto-san and Yue Haibing.
 - Lots of cleanups and enhancements to the Freescale, sunxi dnd
   Intel rivers.
 - Initial Sound Open Firmware suppot for i.MX8.
 - Removal of w90x900 and nuc900 drivers as the platforms are
   being removed.
 - New support for Cirrus Logic CS47L15 and CS47L92, Freescale
   i.MX 7ULP and 8MQ, Meson G12A and NXP UDA1334

1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/wait.h b/include/linux/wait.h
index b6f77cf60dd7..30c515520fb2 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -127,6 +127,19 @@ static inline int waitqueue_active(struct wait_queue_head *wq_head)
 }
 
 /**
+ * wq_has_single_sleeper - check if there is only one sleeper
+ * @wq_head: wait queue head
+ *
+ * Returns true of wq_head has only one sleeper on the list.
+ *
+ * Please refer to the comment for waitqueue_active.
+ */
+static inline bool wq_has_single_sleeper(struct wait_queue_head *wq_head)
+{
+	return list_is_singular(&wq_head->head);
+}
+
+/**
  * wq_has_sleeper - check if there are any waiting processes
  * @wq_head: wait queue head
  *