linux-kernel - Re: [PATCH] sparc: vio: use put

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Date:   Wed, 25 Apr 2018 08:44:39 -0700
From:   Shannon Nelson <shannon.nelson@...cle.com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>, davem@...emloft.net,
        jag.raman@...cle.com, liam.merwick@...cle.com
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH] sparc: vio: use put_device() instead of kfree()

On 4/25/2018 7:56 AM, Arvind Yadav wrote:
> Never directly free @dev after calling device_register(), even
> if it returned an error. Always use put_device() to give up the
> reference initialized.
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>   arch/sparc/kernel/vio.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/sparc/kernel/vio.c b/arch/sparc/kernel/vio.c
> index 1a0fa10..32bae68 100644
> --- a/arch/sparc/kernel/vio.c
> +++ b/arch/sparc/kernel/vio.c
> @@ -403,7 +403,7 @@ static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
>   	if (err) {
>   		printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
>   		       dev_name(&vdev->dev), err);
> -		kfree(vdev);
> +		put_device(&vdev->dev);

Hmmm... I can see why the put_device() might be a good idea, but I think 
we still need the kfree() so as to not leak the memory that was 
kzalloc'd above for vdev.

sln

>   		return NULL;
>   	}
>   	if (vdev->dp)
>