linux-kernel - [PATCH v2 1/2] driver core: Add dev_set_drv_sync

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Message-Id: <20200528190610.179984-2-saravanak@google.com>
Date:   Thu, 28 May 2020 12:06:09 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        John Stultz <john.stultz@...aro.org>,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: [PATCH v2 1/2] driver core: Add dev_set_drv_sync_state()

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@...gle.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