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From: Jason Gunthorpe via iommu <iommu@lists.linux-foundation.org>
To: Baolu Lu <baolu.lu@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Qian Cai <quic_qiancai@quicinc.com>,
	iommu@lists.linux-foundation.org, Will Deacon <will@kernel.org>
Subject: Re: [PATCH] iommu: iommu_group_claim_dma_owner() must always assign a domain
Date: Wed, 4 May 2022 12:00:01 -0300	[thread overview]
Message-ID: <20220504150001.GK49344@nvidia.com> (raw)
In-Reply-To: <a783ff02-6406-0e31-679a-77d43b848a72@linux.intel.com>

On Wed, May 04, 2022 at 10:55:00PM +0800, Baolu Lu wrote:
> On 2022/5/4 22:38, Jason Gunthorpe wrote:
> > > @@ -3180,7 +3181,9 @@ int iommu_group_claim_dma_owner(struct iommu_group
> > > *group, void *owner)
> > >                  ret = -EPERM;
> > >                  goto unlock_out;
> > >          } else {
> > > -               if (group->domain && group->domain != group->default_domain)
> > > {
> > > +               if (group->domain &&
> > > +                   group->domain != group->default_domain &&
> > > +                   group->domain != group->blocking_domain) {
> > Why do we need this hunk? This is just trying to check if there is
> > some conflict with some other domain attach, group->domain can never
> > be blocking_domain here.
> This is *not* needed. Also verified with real hardware.
> 
> Sorry for the noise.

Okay, great, I'll add your tested-by, thanks

Jason
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  reply	other threads:[~2022-05-04 15:00 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-04  0:11 [PATCH] iommu: iommu_group_claim_dma_owner() must always assign a domain Jason Gunthorpe via iommu
2022-05-04  8:22 ` Nicolin Chen via iommu
2022-05-04 11:57   ` Jason Gunthorpe via iommu
2022-05-04 11:48 ` Baolu Lu
2022-05-04 11:53   ` Jason Gunthorpe via iommu
2022-05-04 14:35 ` Baolu Lu
2022-05-04 14:38   ` Jason Gunthorpe via iommu
2022-05-04 14:55     ` Baolu Lu
2022-05-04 15:00       ` Jason Gunthorpe via iommu [this message]
2022-05-04 14:42 ` Robin Murphy
2022-05-04 14:54   ` Jason Gunthorpe via iommu
2022-05-04 15:29     ` Robin Murphy
2022-05-04 18:20       ` Jason Gunthorpe via iommu

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