linux-kernel - [PATCH 5.12 006/677] software node: Allow node addition to already existing device

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Date:   Wed, 12 May 2021 16:40:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: [PATCH 5.12 006/677] software node: Allow node addition to already existing device

From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

commit b622b24519f5b008f6d4e20e5675eaffa8fbd87b upstream.

If the node is added to an already exiting device, the node
needs to be also linked to the device separately.

This will make sure the reference count is kept in balance
also when the node is injected to a device afterwards.

Fixes: e68d0119e328 ("software node: Introduce device_add_software_node()")
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20210414075438.64547-1-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/swnode.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -1032,6 +1032,7 @@ int device_add_software_node(struct devi
 	}
 
 	set_secondary_fwnode(dev, &swnode->fwnode);
+	software_node_notify(dev, KOBJ_ADD);
 
 	return 0;
 }
@@ -1105,8 +1106,8 @@ int software_node_notify(struct device *
 
 	switch (action) {
 	case KOBJ_ADD:
-		ret = sysfs_create_link(&dev->kobj, &swnode->kobj,
-					"software_node");
+		ret = sysfs_create_link_nowarn(&dev->kobj, &swnode->kobj,
+					       "software_node");
 		if (ret)
 			break;