netdev - Re: [PATCH 2/3] vDPA/ifcvf: implement management netlink framework for ifcvf

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Date:   Mon, 5 Jul 2021 02:34:50 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Zhu Lingshan <lingshan.zhu@...el.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 2/3] vDPA/ifcvf: implement management netlink framework
 for ifcvf

On Mon, Jul 05, 2021 at 01:04:11PM +0800, Jason Wang wrote:
> > +static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > +{
> > +	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
> > +	struct device *dev = &pdev->dev;
> > +	struct ifcvf_adapter *adapter;
> 
> 
> adapter is not used.

It's used in error handling below. It's not *initialized*.

> 
> > +	u32 dev_type;
> > +	int ret;
> > +
> > +	ifcvf_mgmt_dev = kzalloc(sizeof(struct ifcvf_vdpa_mgmt_dev), GFP_KERNEL);
> > +	if (!ifcvf_mgmt_dev) {
> > +		IFCVF_ERR(pdev, "Failed to alloc memory for the vDPA management device\n");
> > +		return -ENOMEM;
> > +	}
> > +
> > +	dev_type = get_dev_type(pdev);
> > +	switch (dev_type) {
> > +	case VIRTIO_ID_NET:
> > +		ifcvf_mgmt_dev->mdev.id_table = id_table_net;
> > +		break;
> > +	case VIRTIO_ID_BLOCK:
> > +		ifcvf_mgmt_dev->mdev.id_table = id_table_blk;
> > +		break;
> > +	default:
> > +		IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", dev_type);
> > +		ret = -EOPNOTSUPP;
> > +		goto err;
> > +	}
> > +
> > +	ifcvf_mgmt_dev->mdev.ops = &ifcvf_vdpa_mgmt_dev_ops;
> > +	ifcvf_mgmt_dev->mdev.device = dev;
> > +	ifcvf_mgmt_dev->pdev = pdev;
> > +
> > +	ret = pcim_enable_device(pdev);
> > +	if (ret) {
> > +		IFCVF_ERR(pdev, "Failed to enable device\n");
> > +		goto err;
> > +	}
> > +
> > +	ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
> > +				 IFCVF_DRIVER_NAME);
> > +	if (ret) {
> > +		IFCVF_ERR(pdev, "Failed to request MMIO region\n");
> > +		goto err;
> > +	}
> > +
> > +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> > +	if (ret) {
> > +		IFCVF_ERR(pdev, "No usable DMA configuration\n");
> > +		goto err;
> > +	}
> > +
> > +	ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
> > +	if (ret) {
> > +		IFCVF_ERR(pdev,
> > +			  "Failed for adding devres for freeing irq vectors\n");
> > +		goto err;
> > +	}
> > +
> > +	pci_set_master(pdev);
> > +
> > +	ret = vdpa_mgmtdev_register(&ifcvf_mgmt_dev->mdev);
> > +	if (ret) {
> > +		IFCVF_ERR(pdev,
> > +			  "Failed to initialize the management interfaces\n");
> >   		goto err;
> >   	}
> > @@ -533,14 +610,21 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> >   err:
> >   	put_device(&adapter->vdpa.dev);
> > +	kfree(ifcvf_mgmt_dev);
> >   	return ret;
> >   }