linux-kernel - Re: [PATCH v7 2/4] vfio: ap: register IOMMU VFIO notifier

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Message-Id: <20190429180702.641c9110.pasic@linux.ibm.com>
Date:   Mon, 29 Apr 2019 18:07:02 +0200
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>
Cc:     borntraeger@...ibm.com, alex.williamson@...hat.com,
        cohuck@...hat.com, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        frankja@...ux.ibm.com, akrowiak@...ux.ibm.com, david@...hat.com,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        freude@...ux.ibm.com, mimu@...ux.ibm.com
Subject: Re: [PATCH v7 2/4] vfio: ap: register IOMMU VFIO notifier

On Fri, 26 Apr 2019 15:01:26 +0200
Pierre Morel <pmorel@...ux.ibm.com> wrote:

> @@ -858,7 +887,17 @@ static int vfio_ap_mdev_open(struct mdev_device *mdev)
>  		return ret;
>  	}
>  
> -	return 0;
> +	matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier;
> +	events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
> +	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
> +				     &events, &matrix_mdev->iommu_notifier);
> +	if (!ret)
> +		return ret;
> +
> +	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
> +				 &matrix_mdev->group_notifier);
> +	module_put(THIS_MODULE);

Can you please explain this module_put() here? I don't see anything in
the cover letter.

Regards,
Halil

> +	return ret;
>  }