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Device properties framework fix for 5.13-rc8 

Fix a NULL pointer dereference introduced by a recent commit and
 occurring when device_remove_software_node() is used with a device
 that has never been registered (Heikki Krogerus).
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Merge tag 'devprop-5.13-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull device properties framework fix from Rafael Wysocki:
 "Fix a NULL pointer dereference introduced by a recent commit and
  occurring when device_remove_software_node() is used with a device
  that has never been registered (Heikki Krogerus)"

* tag 'devprop-5.13-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  software node: Handle software node injection to an existing device properly
This commit is contained in:
Linus Torvalds 2021-06-25 10:30:28 -07:00
parent b960e01474 5dca69e26f
commit 7764c62f98
1 changed files with 12 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/base/swnode.c
View File

@ -1045,7 +1045,15 @@ 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);
/*
* If the device has been fully registered by the time this function is
* called, software_node_notify() must be called separately so that the
* symlinks get created and the reference count of the node is kept in
* balance.
*/
if (device_is_registered(dev))
software_node_notify(dev, KOBJ_ADD);
return 0;
}
@ -1065,7 +1073,8 @@ void device_remove_software_node(struct device *dev)
if (!swnode)
return;
software_node_notify(dev, KOBJ_REMOVE);
if (device_is_registered(dev))
software_node_notify(dev, KOBJ_REMOVE);
set_secondary_fwnode(dev, NULL);
kobject_put(&swnode->kobj);
}
@ -1119,8 +1128,7 @@ int software_node_notify(struct device *dev, unsigned long action)
switch (action) {
case KOBJ_ADD:
ret = sysfs_create_link_nowarn(&dev->kobj, &swnode->kobj,
"software_node");
ret = sysfs_create_link(&dev->kobj, &swnode->kobj, "software_node");
if (ret)
break;