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

From: Halil Pasic
Date: Fri Sep 28 2018 - 09:41:52 EST




On 09/28/2018 03:35 PM, Cornelia Huck wrote:
> On Fri, 28 Sep 2018 09:33:21 -0400
> Tony Krowiak <akrowiak@xxxxxxxxxxxxxxxxxx> wrote:
>
>> From: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
>>
>> 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);
>