[PATCH 1/6] iommu/amd: Clear aliases before setting the rlookup_table to NULL

[Pranjal Shrivastava]

In iommu_ignore_device(), clearing the primary devid in the lookup table
before calling setup_aliases() causes rlookup_amd_iommu() to fail for
aliases. This prevents clearing the Device Table Entries (DTEs) for
DMA aliases.

Fix this by moving the setup_aliases() call before clearing the
rlookup_table entry.

Fixes: 99fc4ac3d297 ("iommu/amd: Introduce per PCI segment alias_table")
Reported-by: sashiko-bot@xxxxxxxxxx
Closes: https://lore.kernel.org/all/20260529153216.2AD1E1F00899@xxxxxxxxxxxxxxx/
Signed-off-by: Pranjal Shrivastava <praan@xxxxxxxxxx>
---
 drivers/iommu/amd/iommu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index f1333071da10..a94de66a885e 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -745,10 +745,12 @@ static void iommu_ignore_device(struct amd_iommu *iommu, struct device *dev)
 		return;
 
 	devid = PCI_SBDF_TO_DEVID(sbdf);
-	pci_seg->rlookup_table[devid] = NULL;
-	memset(&dev_table[devid], 0, sizeof(struct dev_table_entry));
 
+	/* Clear aliases while rlookup is still valid */
 	setup_aliases(iommu, dev);
+
+	pci_seg->rlookup_table[devid] = NULL;
+	memset(&dev_table[devid], 0, sizeof(struct dev_table_entry));
 }
 
 
-- 
2.54.0.823.g6e5bcc1fc9-goog