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Message-ID: <ed1b1fbf91abb5b2d6388df48079bf45244e2d94.camel@redhat.com>
Subject: Re: [PATCH 1/8] vfio/mdev: Fix to not do put_device on
 device_register failure
From:   Maxim Levitsky <mlevitsk@redhat.com>
To:     Parav Pandit <parav@mellanox.com>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org, kwankhede@nvidia.com,
        alex.williamson@redhat.com
Date:   Mon, 25 Mar 2019 13:48:51 +0200
In-Reply-To: <1553296835-37522-2-git-send-email-parav@mellanox.com>
References: <1553296835-37522-1-git-send-email-parav@mellanox.com>
         <1553296835-37522-2-git-send-email-parav@mellanox.com>
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On Fri, 2019-03-22 at 18:20 -0500, Parav Pandit wrote:
> device_register() performs put_device() if device_add() fails.
> This balances with device_initialize().
> 
> mdev core performing put_device() when device_register() fails,
> is an error that puts already released device again.
> Therefore, don't put the device on error.
> 
> Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
> Signed-off-by: Parav Pandit <parav@mellanox.com>
> ---
>  drivers/vfio/mdev/mdev_core.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
> index 0212f0e..3e5880a 100644
> --- a/drivers/vfio/mdev/mdev_core.c
> +++ b/drivers/vfio/mdev/mdev_core.c
> @@ -318,10 +318,8 @@ int mdev_device_create(struct kobject *kobj, struct
> device *dev, uuid_le uuid)
>  	dev_set_name(&mdev->dev, "%pUl", uuid.b);
>  
>  	ret = device_register(&mdev->dev);
> -	if (ret) {
> -		put_device(&mdev->dev);
> +	if (ret)
>  		goto mdev_fail;
> -	}
>  
>  	ret = mdev_device_create_ops(kobj, mdev);
>  	if (ret)

Very good catch! Thanks!

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
	Maxim Levitsky