[PATCH 2/4] soundwire: add enumeration_complete structure

[Pierre-Louis Bossart]

We need an async mechanism to prevent access to Slaves that are not
fully-enumerated.

init_completion() will be invoked when the Slave becomes UNATTACHED,
and complete() will be invoked when the state become ATTACHED. Any
read/write before this status change will be delayed with a
wait_for_completion().

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
 include/linux/soundwire/sdw.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index a381a596212b..1381edfaa206 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -565,6 +565,7 @@ struct sdw_slave {
 	u16 dev_num;
 	bool probed;
 	struct completion probe_complete;
+	struct completion enumeration_complete;
 };
 
 #define dev_to_sdw_dev(_dev) container_of(_dev, struct sdw_slave, dev)
-- 
2.20.1