Re: [Qemu-devel] [PATCH] qdev: Remove some non-run codes in qdev_walk_children().

[Anthony Liguori <aliguori@us.ibm.com>]

On 08/07/2011 11:15 PM, Zhi Yong Wu wrote:
> As you have known, qdev_reset_one() forever return a ZERO value to its caller, so some branches can not be forever covered in qdev_walk_children().
>
> I thought that the return value for dev->info->reset(dev) can be returned, but dev->info->reset(dev) is referring to a function with void type.
>
> Signed-off-by: Zhi Yong Wu<wuzhy@linux.vnet.ibm.com>

But the details of qdev_reset_one are irrelevant to 
qdev_walk_children().  There may be other functions that want to walk 
the tree and it's useful to be able to interrupt the tree transversal by 
returning a non-zero value.

Regards,

Anthony Liguori

> ---
>   hw/qdev.c |    5 +----
>   1 files changed, 1 insertions(+), 4 deletions(-)
>
> diff --git a/hw/qdev.c b/hw/qdev.c
> index 292b52f..cbc5e02 100644
> --- a/hw/qdev.c
> +++ b/hw/qdev.c
> @@ -513,10 +513,7 @@ int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
>       int err;
>
>       if (devfn) {
> -        err = devfn(dev, opaque);
> -        if (err) {
> -            return err;
> -        }
> +        devfn(dev, opaque);
>       }
>
>       QLIST_FOREACH(bus,&dev->child_bus, sibling) {