[PATCH v2 1/2] driver core: Add dev_set_drv_sync_state()

[Saravana Kannan]

This can be used by frameworks to set the sync_state() helper functions
for drivers that don't already have them set.

Signed-off-by: Saravana Kannan <sarava...@google.com>
---

I'm hoping I can drop this patch based on discussions in patch 1/2.

 include/linux/device.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index ac8e37cd716a..aac548beb154 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -806,6 +806,18 @@ static inline bool dev_has_sync_state(struct device *dev)
        return false;
 }
 
+static inline int dev_set_drv_sync_state(struct device *dev,
+                                        void (*fn)(struct device *dev))
+{
+       if (!dev || !dev->driver)
+               return 0;
+       if (dev->driver->sync_state && dev->driver->sync_state != fn)
+               return -EBUSY;
+       if (!dev->driver->sync_state)
+               dev->driver->sync_state = fn;
+       return 0;
+}
+
 /*
  * High level routines for use by the bus drivers
  */
-- 
2.27.0.rc0.183.gde8f92d652-goog