linux-kernel - [PATCH 09/11] driver core: Add dev_set_drv_sync

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Message-ID: <20250417142513.312939-10-ulf.hansson@linaro.org>
Date: Thu, 17 Apr 2025 16:25:07 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Saravana Kannan <saravanak@...gle.com>,
	Stephen Boyd <sboyd@...nel.org>,
	linux-pm@...r.kernel.org
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	Bjorn Andersson <andersson@...nel.org>,
	Abel Vesa <abel.vesa@...aro.org>,
	Devarsh Thakkar <devarsht@...v0571a.ent.ti.com>,
	Peng Fan <peng.fan@....nxp.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Johan Hovold <johan@...nel.org>,
	Maulik Shah <maulik.shah@....qualcomm.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 09/11] driver core: Add dev_set_drv_sync_state()

From: Saravana Kannan <saravanak@...gle.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@...gle.com>
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.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