netdev - Re: [PATCH V4 4/5] virtio: introduce a vDPA based transport

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Date:   Fri, 21 Feb 2020 16:06:24 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     "mst@...hat.com" <mst@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "tiwei.bie@...el.com" <tiwei.bie@...el.com>,
        "maxime.coquelin@...hat.com" <maxime.coquelin@...hat.com>,
        "cunming.liang@...el.com" <cunming.liang@...el.com>,
        "zhihong.wang@...el.com" <zhihong.wang@...el.com>,
        "rob.miller@...adcom.com" <rob.miller@...adcom.com>,
        "xiao.w.wang@...el.com" <xiao.w.wang@...el.com>,
        "haotian.wang@...ive.com" <haotian.wang@...ive.com>,
        "lingshan.zhu@...el.com" <lingshan.zhu@...el.com>,
        "eperezma@...hat.com" <eperezma@...hat.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        Parav Pandit <parav@...lanox.com>,
        "kevin.tian@...el.com" <kevin.tian@...el.com>,
        "stefanha@...hat.com" <stefanha@...hat.com>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "aadam@...hat.com" <aadam@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Shahaf Shuler <shahafs@...lanox.com>,
        "hanand@...inx.com" <hanand@...inx.com>,
        "mhabets@...arflare.com" <mhabets@...arflare.com>
Subject: Re: [PATCH V4 4/5] virtio: introduce a vDPA based transport


On 2020/2/20 下午11:19, Jason Gunthorpe wrote:
> On Thu, Feb 20, 2020 at 02:11:40PM +0800, Jason Wang wrote:
>> +static int virtio_vdpa_probe(struct vdpa_device *vdpa)
>> +{
>> +	const struct vdpa_config_ops *ops = vdpa->config;
>> +	struct virtio_vdpa_device *vd_dev;
>> +	int ret = -EINVAL;
>> +
>> +	vd_dev = kzalloc(sizeof(*vd_dev), GFP_KERNEL);
>> +	if (!vd_dev)
>> +		return -ENOMEM;
>> +
>> +	vd_dev->vdev.dev.parent = vdpa_get_dma_dev(vdpa);
>> +	vd_dev->vdev.dev.release = virtio_vdpa_release_dev;
>> +	vd_dev->vdev.config = &virtio_vdpa_config_ops;
>> +	vd_dev->vdpa = vdpa;
>> +	INIT_LIST_HEAD(&vd_dev->virtqueues);
>> +	spin_lock_init(&vd_dev->lock);
>> +
>> +	vd_dev->vdev.id.device = ops->get_device_id(vdpa);
>> +	if (vd_dev->vdev.id.device == 0)
>> +		goto err;
>> +
>> +	vd_dev->vdev.id.vendor = ops->get_vendor_id(vdpa);
>> +	ret = register_virtio_device(&vd_dev->vdev);
>> +	if (ret)
>> +		goto err;
> This error unwind is wrong. register_virtio_device() does
> device_initialize() as it's first action. After that point error
> unwind must be done with put_device() - particularly calling
> kfree(vd_dev) after doing dev_set_name() leaks memory.


Exactly.


>
> Looks like about half of the register_virtio_device() users did this
> right, the others not. Perhaps you should fix them too...
>
> Jason


Will do.

Thanks


>