Yes, Chris, thanks your comments.
How about this one?
---
drivers/iommu/intel-iommu.c | 16 ++++++++++------
1 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a004c39..0fc5efd 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2264,12 +2264,6 @@ static int domain_add_dev_info(struct dmar_domain
*domain,
if (!info)
return -ENOMEM;
- ret = domain_context_mapping(domain, pdev, translation);
- if (ret) {
- free_devinfo_mem(info);
- return ret;
- }
-
info->segment = pci_domain_nr(pdev->bus);
info->bus = pdev->bus->number;
info->devfn = pdev->devfn;
@@ -2282,6 +2276,16 @@ static int domain_add_dev_info(struct dmar_domain
*domain,
pdev->dev.archdata.iommu = info;
spin_unlock_irqrestore(&device_domain_lock, flags);
+ ret = domain_context_mapping(domain, pdev, translation);
+ if (ret) {
+ spin_lock_irqsave(&device_domain_lock, flags);
+ list_del(&info->link);
+ list_del(&info->global);
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+ free_devinfo_mem(info);
+ return ret;
+ }
+
return 0;
}
> -----Original Message-----
> From: Chris Wright [mailto:[email protected]]
> Sent: Wednesday, December 21, 2011 12:08 AM
> To: Hao, Xudong
> Cc: [email protected]; [email protected]; Zhang, Xiantao;
> [email protected]; [email protected]
> Subject: Re: [PATCH] intel-iommu: Add device info into list before doing
> context
> mapping
>
> * Hao, Xudong ([email protected]) wrote:
> > @@ -2282,6 +2276,14 @@ static int domain_add_dev_info(struct
> dmar_domain *domain,
> > pdev->dev.archdata.iommu = info;
> > spin_unlock_irqrestore(&device_domain_lock, flags);
> >
> > + ret = domain_context_mapping(domain, pdev, translation);
> > + if (ret) {
> > + list_del(&info->link);
> > + list_del(&info->global);
>
> At the very least, this is not correct locking.
>
> > + free_devinfo_mem(info);
> > + return ret;
> > + }
> > +
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