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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Fri, Jun 24, 2022 at 01:38:58PM +0800, Yong Wu wrote: > > > > diff --git a/drivers/iommu/mtk_iommu_v1.c > > > > b/drivers/iommu/mtk_iommu_v1.c > > > > index e1cb51b9866c..5386d889429d 100644 > > > > --- a/drivers/iommu/mtk_iommu_v1.c > > > > +++ b/drivers/iommu/mtk_iommu_v1.c > > > > @@ -304,7 +304,7 @@ static int mtk_iommu_v1_attach_device(struct > > > > iommu_domain *domain, struct device > > > > /* Only allow the domain created internally. */ > > > > mtk_mapping = data->mapping; > > > > if (mtk_mapping->domain != domain) > > > > - return 0; > > > > + return -EMEDIUMTYPE; > > > > > > > > if (!data->m4u_dom) { > > > > data->m4u_dom = dom; > > > > > > This change looks odd. It turns the return value from success to > > > failure. Is it a bug? If so, it should go through a separated fix > > > patch. > > Thanks for the review:) > > > > > Makes sense. > > > > I read the commit log of the original change: > > > https://lore.kernel.org/r/1589530123-30240-1-git-send-email-yong.wu@mediatek.com > > > > It doesn't seem to allow devices to get attached to different > > domains other than the shared mapping->domain, created in the > > in the mtk_iommu_probe_device(). So it looks like returning 0 > > is intentional. Though I am still very confused by this return > > value here, I doubt it has ever been used in a VFIO context. > > It's not used in VFIO context. "return 0" just satisfy the iommu > framework to go ahead. and yes, here we only allow the shared "mapping- > >domain" (All the devices share a domain created internally). > > thus I think we should still keep "return 0" here. Thanks for the reply. I will just drop the change of this file. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu