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

Pierre Morel
2018-06-13T07:41:16Z

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