Re: [PATCH v2] soc: mpfs: use kref cleanup on probe failure

[Conor Dooley <conor@kernel.org>]

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On Wed, Oct 07, 2026 at 08:17:43PM +0800, Guangshuo Li wrote:
> After kref_init(), the device_get_match_data() failure path frees the
> mailbox channel and sys_controller directly, bypassing the matching
> kref_put() for the initial reference.
> 
> Use mpfs_sys_controller_put() on this path so that the initial
> reference established by kref_init() is released through the existing
> kref release callback.
> 
> Rename the error label to reflect that cleanup is now performed
> through the kref helper.
> 
> This issue was found by manual code inspection.
> 
> Fixes: 75ef23397558 ("soc: microchip: mpfs-sys-controller: fix resource leak on probe error")
> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
> ---
> v2:
>   - Add the missing Signed-off-by tag.
>   - Rename out_free_channel to out_put as suggested by Felix.

Applied, thanks.

Cheers,
Conor.

> 
>  drivers/soc/microchip/mpfs-sys-controller.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/soc/microchip/mpfs-sys-controller.c b/drivers/soc/microchip/mpfs-sys-controller.c
> index 0400a01b2338..ef27e1083f0f 100644
> --- a/drivers/soc/microchip/mpfs-sys-controller.c
> +++ b/drivers/soc/microchip/mpfs-sys-controller.c
> @@ -159,7 +159,7 @@ static int mpfs_sys_controller_probe(struct platform_device *pdev)
>  	of_data = (struct mpfs_syscon_config *) device_get_match_data(dev);
>  	if (!of_data) {
>  		ret = dev_err_probe(dev, -EINVAL, "Error getting match data\n");
> -		goto out_free_channel;
> +		goto out_put;
>  	}
>  
>  	for (i = 0; i < of_data->nb_subdevs; i++) {
> @@ -173,8 +173,9 @@ static int mpfs_sys_controller_probe(struct platform_device *pdev)
>  
>  	return 0;
>  
> -out_free_channel:
> -	mbox_free_channel(sys_controller->chan);
> +out_put:
> +	mpfs_sys_controller_put(sys_controller);
> +	return ret;
>  out_free:
>  	kfree(sys_controller);
>  	return ret;
> -- 
> 2.43.0
> 

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