linux-kernel - [PATCH 2/3] driver core: Introduce fw_devlink_relax

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Message-ID: <20250814111023.2693-3-wangwensheng4@huawei.com>
Date: Thu, 14 Aug 2025 19:10:22 +0800
From: Wang Wensheng <wangwensheng4@...wei.com>
To: <gregkh@...uxfoundation.org>, <rafael@...nel.org>, <dakr@...nel.org>,
	<tglx@...utronix.de>, <saravanak@...gle.com>, <robh@...nel.org>,
	<broonie@...nel.org>, <linux-kernel@...r.kernel.org>
CC: <chenjun102@...wei.com>, <wangwensheng4@...wei.com>
Subject: [PATCH 2/3] driver core: Introduce fw_devlink_relax_consumers helper

Some devices are added during its parent's probe and will never get
bound to a driver. In this case, with fw_devlink set to "rpm",
which is the default value, its consumers will be deferred probe
until deferred_probe_timeout when fw_devlink_drivers_done() would
relax the devlinks to the suplier.

Use this function to relax the consumer devlinks, just like what we
do for the unmatched devices in fw_devlink_drivers_done(), so that
the consumer devices would be probed not that later.

Signed-off-by: Wang Wensheng <wangwensheng4@...wei.com>
---
 drivers/base/core.c    | 22 ++++++++++++++++++++++
 include/linux/device.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index d22d6b23e758..2f7101ad9d11 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1754,6 +1754,28 @@ static void fw_devlink_relax_link(struct device_link *link)
 		dev_name(link->supplier));
 }
 
+/**
+ * fw_devlink_relax_consumers - Relax the devlinks with all its consumers
+ * @dev: Device whose consumer devlinks will be relaxed
+ *
+ * Some devices are added during its parent's probe and will never get bound
+ * to a driver. In this case its consumers will be deferred probe until
+ * deferred_probe_timeout.
+ *
+ * Use this function to relax the consumer devlinks so that the consumers
+ * device would be probed not that later.
+ */
+void fw_devlink_relax_consumers(struct device *dev)
+{
+	struct device_link *link;
+
+	device_links_write_lock();
+	list_for_each_entry(link, &dev->links.consumers, s_node)
+		fw_devlink_relax_link(link);
+	device_links_write_unlock();
+}
+EXPORT_SYMBOL_GPL(fw_devlink_relax_consumers);
+
 static int fw_devlink_no_driver(struct device *dev, void *data)
 {
 	struct device_link *link = to_devlink(dev);
diff --git a/include/linux/device.h b/include/linux/device.h
index 0470d19da7f2..a451c0eb2ffa 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1201,6 +1201,7 @@ void device_link_remove(void *consumer, struct device *supplier);
 void device_links_supplier_sync_state_pause(void);
 void device_links_supplier_sync_state_resume(void);
 void device_link_wait_removal(void);
+void fw_devlink_relax_consumers(struct device *dev);
 
 static inline bool device_link_test(const struct device_link *link, u32 flags)
 {
-- 
2.22.0