linux-kernel - Re: [PATCH 3/8] vfio/mdev: Removed unused kref

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Date:   Mon, 25 Mar 2019 13:50:48 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Parav Pandit <parav@...lanox.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kwankhede@...dia.com,
        alex.williamson@...hat.com
Subject: Re: [PATCH 3/8] vfio/mdev: Removed unused kref

On Fri, 2019-03-22 at 18:20 -0500, Parav Pandit wrote:
> Remove unused kref from the mdev_device structure.
> 
> Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
> Signed-off-by: Parav Pandit <parav@...lanox.com>
> ---
>  drivers/vfio/mdev/mdev_core.c    | 1 -
>  drivers/vfio/mdev/mdev_private.h | 1 -
>  2 files changed, 2 deletions(-)
> 
> diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
> index 4f213e4d..3d91f62 100644
> --- a/drivers/vfio/mdev/mdev_core.c
> +++ b/drivers/vfio/mdev/mdev_core.c
> @@ -311,7 +311,6 @@ int mdev_device_create(struct kobject *kobj, struct device
> *dev, uuid_le uuid)
>  	mutex_unlock(&mdev_list_lock);
>  
>  	mdev->parent = parent;
> -	kref_init(&mdev->ref);
>  
>  	mdev->dev.parent  = dev;
>  	mdev->dev.bus     = &mdev_bus_type;
> diff --git a/drivers/vfio/mdev/mdev_private.h
> b/drivers/vfio/mdev/mdev_private.h
> index b5819b7..84b2b6c 100644
> --- a/drivers/vfio/mdev/mdev_private.h
> +++ b/drivers/vfio/mdev/mdev_private.h
> @@ -30,7 +30,6 @@ struct mdev_device {
>  	struct mdev_parent *parent;
>  	uuid_le uuid;
>  	void *driver_data;
> -	struct kref ref;
>  	struct list_head next;
>  	struct kobject *type_kobj;
>  	bool active;

When develping my nvme-mdev driver, I'll seen that unused kref too.
Dead code has to go.

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

Best regards,
	Maxim Levitsky