linux-kernel - Re: [FIXUP v11] fixup! s390: vfio-ap: implement mediated device open callback

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Date:   Fri, 28 Sep 2018 15:35:06 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        kwankhede@...dia.com, bjsdjshi@...ux.vnet.ibm.com,
        pbonzini@...hat.com, alex.williamson@...hat.com,
        pmorel@...ux.vnet.ibm.com, alifm@...ux.vnet.ibm.com,
        mjrosato@...ux.vnet.ibm.com, jjherne@...ux.vnet.ibm.com,
        thuth@...hat.com, pasic@...ux.vnet.ibm.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: Re: [FIXUP v11] fixup! s390: vfio-ap: implement mediated device
 open callback

On Fri, 28 Sep 2018 09:33:21 -0400
Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:

> From: Tony Krowiak <akrowiak@...ux.ibm.com>
> 
> Fixes case statement in vfio_ap_mdev_copy_masks() function in
> vfio-ap-ops.c.
> ---
>  drivers/s390/crypto/vfio_ap_ops.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> index e1e1beaaeba5..86b42487a51c 100644
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -741,11 +741,12 @@ static void vfio_ap_mdev_copy_masks(struct ap_matrix_mdev *matrix_mdev)
>  		break;
>  	case CRYCB_FORMAT1:
>  	case CRYCB_FORMAT0:
> -	default:
>  		apm = (unsigned long *)crycb->apcb0.apm;
>  		aqm = (unsigned long *)crycb->apcb0.aqm;
>  		adm = (unsigned long *)crycb->apcb0.adm;
>  		break;
> +	default:
> +		return;

/* cannot happen */

?

>  	}
>  
>  	nbytes = DIV_ROUND_UP(matrix_mdev->matrix.apm_max + 1, BITS_PER_BYTE);