On Thu, Nov 26, 2020 at 10:29:57AM +0800, Yang Yingliang wrote: > > On 2020/11/25 19:35, Will Deacon wrote: > > On Wed, Nov 25, 2020 at 09:54:34AM +0800, Yang Yingliang wrote: > > > On 2020/11/18 6:41, Will Deacon wrote: > > > > On Tue, Nov 17, 2020 at 07:11:28PM +0800, Yang Yingliang wrote: > > > > > On 2020/11/17 17:40, Lu Baolu wrote: > > > > > > On 2020/11/17 10:52, Yang Yingliang wrote: > > > > > > > If iommu_group_get() failed, it need return error code > > > > > > > in iommu_probe_device(). > > > > > > > > > > > > > > Fixes: cf193888bfbd ("iommu: Move new probe_device path...") > > > > > > > Reported-by: Hulk Robot <hul...@huawei.com> > > > > > > > Signed-off-by: Yang Yingliang <yangyingli...@huawei.com> > > > > > > > --- > > > > > > > drivers/iommu/iommu.c | 4 +++- > > > > > > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > > > > > > > > > > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > > > > > > > index b53446bb8c6b..6f4a32df90f6 100644 > > > > > > > --- a/drivers/iommu/iommu.c > > > > > > > +++ b/drivers/iommu/iommu.c > > > > > > > @@ -253,8 +253,10 @@ int iommu_probe_device(struct device *dev) > > > > > > > goto err_out; > > > > > > > group = iommu_group_get(dev); > > > > > > > - if (!group) > > > > > > > + if (!group) { > > > > > > > + ret = -ENODEV; > > > > > > Can you please explain why you use -ENODEV here? > > > > > Before 79659190ee97 ("iommu: Don't take group reference in > > > > > iommu_alloc_default_domain()"), in > > > > > > > > > > iommu_alloc_default_domain(), if group is NULL, it will return > > > > > -ENODEV. > > > > Hmm. While I think the patch is ok, I'm not sure it qualifies as a fix. > > > > Has iommu_probe_device() ever propagated this error? The commit you > > > > identify in the 'Fixes:' tag doesn't seem to change this afaict. > > > I think after this commit 439945e74a4b ("iommu: Move default domain > > > allocation to iommu_probe_device()"), > > That SHA doesn't exist in my tree (maybe you mean 6e1aa2049154?). But even > > then, I'm not sure 6e1aa2049154 is actually broken if you look at the > > interaction with group creation in __iommu_probe_device(). > > > > In fact, isn't that the case in mainline too? If __iommu_probe_device() > > returns 0, then we _know_ a group exists and so iommu_group_get() will > > succeed. I'm still happy with the patch in case this changes in future, > > but it doesn't appear to be fixing anything. Do you agree? > > Yes, I look into the __iommu_probe_device(), if it can't get group, it will > return error > > first. Do I need send a v2 without the fix tag ?
Yes, I think that would be fine, and perhaps update the commit message to make it clear that this is purely cosmetic. Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu