iommu/amd: Check for busy devices earlier in attach_device()

Check early in attach_device whether the device is already attached to a
domain. This also simplifies the code path so that __attach_device() can
be removed.

Fixes: 92d420ec028d ("iommu/amd: Relax locking in dma_ops path")
Reviewed-by: Filippo Sironi <sironi@amazon.de>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 2919168..459247c 100644 (file)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2072,23 +2072,6 @@ static void do_detach(struct iommu_dev_data *dev_data)
        domain->dev_cnt                 -= 1;
 }
 
-/*
- * If a device is not yet associated with a domain, this function makes the
- * device visible in the domain
- */
-static int __attach_device(struct iommu_dev_data *dev_data,
-                          struct protection_domain *domain)
-{
-       if (dev_data->domain != NULL)
-               return -EBUSY;
-
-       /* Attach alias group root */
-       do_attach(dev_data, domain);
-
-       return 0;
-}
-
-
 static void pdev_iommuv2_disable(struct pci_dev *pdev)
 {
        pci_disable_ats(pdev);
@@ -2174,6 +2157,10 @@ static int attach_device(struct device *dev,
 
        dev_data = get_dev_data(dev);
 
+       ret = -EBUSY;
+       if (dev_data->domain != NULL)
+               goto out;
+
        if (!dev_is_pci(dev))
                goto skip_ats_check;
 
@@ -2198,7 +2185,9 @@ static int attach_device(struct device *dev,
        }
 
 skip_ats_check:
-       ret = __attach_device(dev_data, domain);
+       ret = 0;
+
+       do_attach(dev_data, domain);
 
        /*
         * We might boot into a crash-kernel here. The crashed kernel