[PATCH v1 1/2] driver core: Add dev_set_drv_sync_state()

From: Saravana Kannan <saravanak@google.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>,
	kernel-team@android.com, linux-clk@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v1 1/2] driver core: Add dev_set_drv_sync_state()
Date: Tue,  6 Apr 2021 20:44:54 -0700	[thread overview]
Message-ID: <20210407034456.516204-2-saravanak@google.com> (raw)
In-Reply-To: <20210407034456.516204-1-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>
---
 include/linux/device.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index ba660731bd25..35e8833ca16b 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -778,6 +778,18 @@ 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
  */
-- 
2.31.1.295.g9ea45b61b8-goog

