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Date: Mon, 5 Mar 2018 16:27:43 +0800
From: Peter Xu <peterx@redhat.com>
Message-ID: <20180305082743.GC7584@xz-mi>
References: <1519900415-30314-1-git-send-email-yi.l.liu@linux.intel.com>
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In-Reply-To: <1519900415-30314-9-git-send-email-yi.l.liu@linux.intel.com>
Subject: Re: [Qemu-devel] [PATCH v3 08/12] hw/pci: introduce
 pci_device_notify_iommu()
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To: "Liu, Yi L" <yi.l.liu@linux.intel.com>
Cc: qemu-devel@nongnu.org, mst@redhat.com, david@gibson.dropbear.id.au, pbonzini@redhat.com, alex.williamson@redhat.com, eric.auger.pro@gmail.com, yi.l.liu@intel.com, kevin.tian@intel.com, jasowang@redhat.com

On Thu, Mar 01, 2018 at 06:33:31PM +0800, Liu, Yi L wrote:

[...]

> -void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque)
> +void pci_device_notify_iommu(PCIDevice *dev, PCIDevNotifyType type)
>  {
> -    bus->iommu_fn = fn;
> +    PCIBus *bus = PCI_BUS(pci_get_bus(dev));
> +    PCIBus *iommu_bus = bus;
> +
> +    while (iommu_bus && !iommu_bus->iommu_fn && iommu_bus->parent_dev) {
> +        iommu_bus = PCI_BUS(pci_get_bus(iommu_bus->parent_dev));
> +    }
> +    if (iommu_bus && iommu_bus->notify_fn) {
> +        iommu_bus->notify_fn(bus,
> +                             iommu_bus->iommu_opaque,
> +                             dev->devfn,
> +                             type);

We didn't really check the return code for notify function.  What if
it failed?  If we care, we'd better handle the failure; or we can just
define the notify_fn() to return void (now it's int).

> +    }
> +    return;

I saw many places in the series that you added explicit return for
"void" return-typed functions.  IMHO all of them can be dropped.

> +}

Thanks,

-- 
Peter Xu