linux-kernel - Re: [RFC 08/19] s390/zcrypt: support for assigning adapters to matrix mdev

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Message-ID: <20171117105027.3c799524.cohuck@redhat.com>
Date:   Fri, 17 Nov 2017 10:50:27 +0100
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, qemu-s390x@...gnu.org,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com
Subject: Re: [RFC 08/19] s390/zcrypt: support for assigning adapters to
 matrix mdev

On Thu, 16 Nov 2017 18:53:07 -0500
Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:

> On 11/14/2017 08:22 AM, Cornelia Huck wrote:
> > On Fri, 13 Oct 2017 13:38:53 -0400
> > Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:

> >> +static ssize_t ap_matrix_adapters_assign(struct device *dev,
> >> +					 struct device_attribute *attr,
> >> +					 const char *buf, size_t count)
> >> +{
> >> +	int ret;
> >> +	unsigned int apid;
> >> +	struct mdev_device *mdev = mdev_from_dev(dev);
> >> +	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
> >> +
> >> +	ret = ap_matrix_parse_id(buf, &apid);  
> I'm going to replace this with a call to kstrtouint (buf, 0, &apid). This
> will allow the user to enter the adapter ID string using conventional
> semantics - e.g., 71 or  0x47 - and the function will determine if the
> value is valid.

Using an existing interface sounds good.