[PATCH 09/11] driver core: Add dev_set_drv_sync_state()

Ulf Hansson
2025-04-17T14:25:48Z

From: Saravana Kannan <saravanak@google.com>

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 <saravanak@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

Note that, I have picked this patch from another series [1] that are about to be
re-freshed.

[1]
https://lore.kernel.org/all/YG6lhT7vuiCNvvDg@kroah.com/

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

diff --git a/include/linux/device.h b/include/linux/device.h
index 79e49fe494b7..544523d48cd4 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -955,6 +955,18 @@ 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;
+}
+
static inline void dev_set_removable(struct device *dev,
enum device_removable removable)
{
--
2.43.0