linux-kernel - Re: [PATCH] um: virt-pci: set device ready in probe()

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Message-ID: <20220616104052.GA7518@axis.com>
Date:   Thu, 16 Jun 2022 12:40:52 +0200
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Jason Wang <jasowang@...hat.com>
CC:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        kernel <kernel@...s.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "linux-um@...ts.infradead.org" <linux-um@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] um: virt-pci: set device ready in probe()

On Mon, Jun 13, 2022 at 08:58:40AM +0200, Jason Wang wrote:
> On Fri, Jun 10, 2022 at 11:12 PM Vincent Whitchurch <vincent.whitchurch@...s.com> wrote:
> > diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
> > index 5c092a9153ea..027847023184 100644
> > --- a/arch/um/drivers/virt-pci.c
> > +++ b/arch/um/drivers/virt-pci.c
> > @@ -544,6 +544,8 @@ static int um_pci_init_vqs(struct um_pci_device *dev)
> >         dev->cmd_vq = vqs[0];
> >         dev->irq_vq = vqs[1];
> >
> > +       virtio_device_ready(dev->vdev);
> > +
> >         for (i = 0; i < NUM_IRQ_MSGS; i++) {
> >                 void *msg = kzalloc(MAX_IRQ_MSG_SIZE, GFP_KERNEL);
> >
> > @@ -587,7 +589,7 @@ static int um_pci_virtio_probe(struct virtio_device *vdev)
> >         dev->irq = irq_alloc_desc(numa_node_id());
> >         if (dev->irq < 0) {
> >                 err = dev->irq;
> > -               goto error;
> > +               goto err_reset;
> >         }
> >         um_pci_devices[free].dev = dev;
> >         vdev->priv = dev;
> > @@ -604,6 +606,9 @@ static int um_pci_virtio_probe(struct virtio_device *vdev)
> >
> >         um_pci_rescan();
> >         return 0;
> > +err_reset:
> > +       virtio_reset_device(vdev);
> > +       vdev->config->del_vqs(vdev);
> 
> This part seems to be an independent fix.

Yes, I guess that last line could have been added in a separate patch.
When adding the cleanup in the error path for the virtio_device_ready()
call added by the patch I noticed that this driver wasn't deleting its
virtqueues in the error path, unlike other virtio drivers I looked at.