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

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Message-ID: <20220613032529-mutt-send-email-mst@kernel.org>
Date:   Mon, 13 Jun 2022 03:25:44 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>, kernel@...s.com,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        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 02:58:40PM +0800, Jason Wang wrote:
> On Fri, Jun 10, 2022 at 11:12 PM Vincent Whitchurch
> <vincent.whitchurch@...s.com> wrote:
> >
> > Call virtio_device_ready() to make this driver work after commit
> > b4ec69d7e09 ("virtio: harden vring IRQ"), since the driver uses the
> > virtqueues in the probe function.  (The virtio core sets the device
> > ready when probe returns.)
> >
> > Fixes: 8b4ec69d7e09 ("virtio: harden vring IRQ")
> > Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> > ---
> >  arch/um/drivers/virt-pci.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > 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.
> 
> Thanks


Yes good point. I merged as is, oh well.

> >  error:
> >         mutex_unlock(&um_pci_mtx);
> >         kfree(dev);
> > --
> > 2.34.1
> >