On Wed, 29 Nov 2017 09:23:01 +0800 weiping zhang <[email protected]> wrote:
> index can be reused by other virtio device. > > Signed-off-by: weiping zhang <[email protected]> Reviewed-by: Cornelia Huck <[email protected]> > --- > drivers/virtio/virtio.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c > index 48230a5..bf7ff39 100644 > --- a/drivers/virtio/virtio.c > +++ b/drivers/virtio/virtio.c > @@ -333,6 +333,8 @@ int register_virtio_device(struct virtio_device *dev) > /* device_register() causes the bus infrastructure to look for a > * matching driver. */ > err = device_register(&dev->dev); > + if (err) > + ida_simple_remove(&virtio_index_ida, dev->index); > out: > if (err) > virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED); I think your patch is correct (giving up the index if we failed to register), but this made me look at our error handling if a virtio device failed to register. We hold an extra reference to the struct device, even after a failed register, and it is the responsibility of the caller to give up that reference once no longer needed. As callers toregister_virtio_device() embed the struct virtio_device, it needs to be their responsibility. Looking at the existing callers, - ccw does a put_device - pci, mmio and remoteproc do nothing, causing a leak - vop does a free on the embedding structure, which is a big no-no Thoughts? _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
