From: Jon Derrick <jonathan.derrick@intel.com>
Date: Wed, 27 May 2020 10:56:17 -0600
Subject: iommu/vt-d: Remove real DMA lookup in find_domain
Git-commit: bba9cc2cf82840bd3c9b3f4f7edac2dc8329c241
Patch-mainline: v5.8-rc1
References: bsc#1175713
By removing the real DMA indirection in find_domain(), we can allow
sub-devices of a real DMA device to have their own valid
device_domain_info. The dmar lookup and context entry removal paths have
been fixed to account for sub-devices.
Fixes: 2b0140c69637 ("iommu/vt-d: Use pci_real_dma_dev() for mapping")
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200527165617.297470-4-jonathan.derrick@intel.com
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207575
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/intel-iommu.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6d39b9bd89a6..5767882aa80f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2436,9 +2436,6 @@ struct dmar_domain *find_domain(struct device *dev)
if (unlikely(attach_deferred(dev) || iommu_dummy(dev)))
return NULL;
- if (dev_is_pci(dev))
- dev = &pci_real_dma_dev(to_pci_dev(dev))->dev;
-
/* No lock here, assumes no domain exit in normal case */
info = get_domain_info(dev);
if (likely(info))