diff options
| author | Joerg Roedel <jroedel@suse.de> | 2019-09-25 15:22:58 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-09-28 14:43:58 +0200 |
| commit | 45e528d9c479aeef2d3d1db1e619b243f91e324f (patch) | |
| tree | 4e25b8515f6b8319e6951ea5c4ea87afc050f22b /drivers | |
| parent | iommu/amd: Take domain->lock for complete attach/detach path (diff) | |
| download | linux-45e528d9c479aeef2d3d1db1e619b243f91e324f.tar.xz linux-45e528d9c479aeef2d3d1db1e619b243f91e324f.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 25 |
1 files changed, 7 insertions, 18 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 2919168577ff..459247c32dc0 100644 --- 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 |