[PATCH 3/4] EDAC/versalnet: use put_device() on device_register() failure

[Pandey, Radhey Shyam]

On 8/10/2026 9:58 PM, Tarun Sahu wrote:
> When device_register() fails, calling kfree(dev) directly bypasses the
> device_release() callback (versal_edac_release) and leaks the allocated
> driver core structures.
> 
> Fix this by calling put_device(dev) when device_register() returns an
> error, ensuring proper refcount decrement and release cleanup.
> 
> Signed-off-by: Tarun Sahu <tarunsahu at google.com>

Thanks for the patch. FYI, this issue is already being addressed in an
ongoing series.
https://lore.kernel.org/all/20260724171945.2812749-5-shubhrajyoti.datta@amd.com/

-Radhey

> ---
>   drivers/edac/versalnet_edac.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/edac/versalnet_edac.c b/drivers/edac/versalnet_edac.c
> index 97ec05d68bbb..2912b3658915 100644
> --- a/drivers/edac/versalnet_edac.c
> +++ b/drivers/edac/versalnet_edac.c
> @@ -829,8 +829,10 @@ static int init_one_mc(struct mc_priv *priv, struct platform_device *pdev, int i
>   	dev->release = versal_edac_release;
>   
>   	rc = device_register(dev);
> -	if (rc)
> +	if (rc) {
> +		put_device(dev);
>   		goto err_mc_free;
> +	}
>   
>   	mci->pdev = dev;
>   	mc_init(mci, dev);
> @@ -852,9 +854,9 @@ static int init_one_mc(struct mc_priv *priv, struct platform_device *pdev, int i
>   	device_unregister(mci->pdev);
>   err_mc_free:
>   	edac_mc_free(mci);
> +	return rc;
>   err_dev_free:
>   	kfree(dev);
> -
>   	return rc;
>   }
>