linux-kernel - Re: [PATCH v5 04/13] s390: vfio-ap: base implementation of VFIO AP device driver

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Message-Id: <889b8d41-e08c-0eb5-2de0-a1d6669a03b3@linux.ibm.com>
Date:   Wed, 13 Jun 2018 09:41:16 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.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, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com
Subject: Re: [PATCH v5 04/13] s390: vfio-ap: base implementation of VFIO AP
 device driver

On 07/05/2018 17:11, Tony Krowiak wrote:
> Introduces a new AP device driver. This device driver
> is built on the VFIO mediated device framework. The framework
> provides sysfs interfaces that facilitate passthrough
> access by guests to devices installed on the linux host.
...snip...

> +static int vfio_ap_matrix_dev_create(void)
> +{
> +	int ret;
> +
> +	vfio_ap_root_device = root_device_register(VFIO_AP_ROOT_NAME);
> +
> +	if (IS_ERR(vfio_ap_root_device)) {
> +		ret = PTR_ERR(vfio_ap_root_device);
> +		goto done;
> +	}
> +
> +	ap_matrix = kzalloc(sizeof(*ap_matrix), GFP_KERNEL);
> +	if (!ap_matrix) {
> +		ret = -ENOMEM;
> +		goto matrix_alloc_err;
> +	}
> +
> +	ap_matrix->device.type = &vfio_ap_dev_type;
> +	dev_set_name(&ap_matrix->device, "%s", VFIO_AP_DEV_NAME);
> +	ap_matrix->device.parent = vfio_ap_root_device;
> +	ap_matrix->device.release = vfio_ap_matrix_dev_release;
> +	ap_matrix->device.driver = &vfio_ap_drv.driver;
> +
> +	ret = device_register(&ap_matrix->device);
> +	if (ret)
> +		goto matrix_reg_err;
> +
> +	goto done;
> +
> +matrix_reg_err:
> +	put_device(&ap_matrix->device);

Did not see this before but here you certainly want to
do a kfree and not a put_device.



> +
> +matrix_alloc_err:
> +	root_device_unregister(vfio_ap_root_device);
> +
> +done:
> +	return ret;
> +}
> +
> +static void vfio_ap_matrix_dev_destroy(struct ap_matrix *ap_matrix)
> +{
> +	device_unregister(&ap_matrix->device);
> +	root_device_unregister(vfio_ap_root_device);

Also here you need a kfree(ap_matrix) too .

Pierre


-- 
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany