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Subject: Re: [FIXUP v11] fixup! s390: vfio-ap: implement mediated device open
 callback
To:     Cornelia Huck <cohuck@redhat.com>,
        Tony Krowiak <akrowiak@linux.vnet.ibm.com>
Cc:     linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
        kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com,
        pbonzini@redhat.com, alex.williamson@redhat.com,
        pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com,
        mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com,
        thuth@redhat.com, pasic@linux.vnet.ibm.com,
        fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com,
        Tony Krowiak <akrowiak@linux.ibm.com>
References: <20180928121429.7323d78b.cohuck@redhat.com>
 <20180928133321.31884-1-akrowiak@linux.vnet.ibm.com>
 <20180928153506.3521bc33.cohuck@redhat.com>
From:   Halil Pasic <pasic@linux.ibm.com>
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Date:   Fri, 28 Sep 2018 15:41:35 +0200
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On 09/28/2018 03:35 PM, Cornelia Huck wrote:
> On Fri, 28 Sep 2018 09:33:21 -0400
> Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:
> 
>> From: Tony Krowiak <akrowiak@linux.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 */
> 
> ?

Or use something like BUG(). Without conveying that default is illegal we
don't gain anything over the previous version IMHO.

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