[PATCH] software node: Allow node addition to already existing device

[PATCH] software node: Allow node addition to already existing device

[Heikki Krogerus]

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.

Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Fixes: e68d0119e328 ("software node: Introduce device_add_software_node()")
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/base/swnode.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 740333629b420..3cc11b813f28c 100644
--- 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;
 
-- 
2.30.2

Re: [PATCH] software node: Allow node addition to already existing device

[Heikki Krogerus]

+Greg

Sorry about that. Should I resend this?

On Wed, Apr 14, 2021 at 10:54:38AM +0300, Heikki Krogerus wrote:
> 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.
> 
> Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
> Fixes: e68d0119e328 ("software node: Introduce device_add_software_node()")
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> ---
>  drivers/base/swnode.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index 740333629b420..3cc11b813f28c 100644
> --- 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;
>  
> -- 
> 2.30.2

-- 
heikki

Re: [PATCH] software node: Allow node addition to already existing device

[Greg Kroah-Hartman]

On Wed, Apr 14, 2021 at 12:13:35PM +0300, Heikki Krogerus wrote:
> +Greg
> 
> Sorry about that. Should I resend this?

No worries, I can pick it up, thanks

`b4` really is nice to use :)

greg k-h

Re: [PATCH] software node: Allow node addition to already existing device

[Heikki Krogerus]

On Wed, Apr 14, 2021 at 11:17:55AM +0200, Greg Kroah-Hartman wrote:
> On Wed, Apr 14, 2021 at 12:13:35PM +0300, Heikki Krogerus wrote:
> > +Greg
> > 
> > Sorry about that. Should I resend this?
> 
> No worries, I can pick it up, thanks
> 
> `b4` really is nice to use :)

Yes, it's a really nice tool.

thanks,

-- 
heikki