software node: Allow node addition to already existing device

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@linux.intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210414075438.64547-1-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 740333629b4202f4a109721f6166700a3732c93f..3cc11b813f28ca8ff6cb508b83cd3d1d2c996cce 100644 (file)
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -1045,6 +1045,7 @@ int device_add_software_node(struct device *dev, const struct software_node *nod
        }
 
        set_secondary_fwnode(dev, &swnode->fwnode);
+       software_node_notify(dev, KOBJ_ADD);
 
        return 0;
 }
@@ -1118,8 +1119,8 @@ int software_node_notify(struct device *dev, unsigned long action)
 
        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;