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amd iommu: properly detach from protection domain on ->remove
Some drivers may use the dma api during ->remove which will cause a protection domain to get reattached to a device. Delay the detach until after the driver is completely unbound. [ joro: added a little merge helper ] [ Impact: fix too early device<->domain removal ] Signed-off-by: Chris Wright <chrisw@redhat.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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@ -57,6 +57,10 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
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static struct dma_ops_domain *find_protection_domain(u16 devid);
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#ifndef BUS_NOTIFY_UNBOUND_DRIVER
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#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
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#endif
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#ifdef CONFIG_AMD_IOMMU_STATS
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/*
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@ -1012,7 +1016,7 @@ static int device_change_notifier(struct notifier_block *nb,
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printk(KERN_INFO "AMD IOMMU: Using protection domain %d for "
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"device %s\n", dma_domain->domain.id, dev_name(dev));
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break;
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case BUS_NOTIFY_UNBIND_DRIVER:
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case BUS_NOTIFY_UNBOUND_DRIVER:
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if (!domain)
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goto out;
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detach_device(domain, devid);
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