[PATCH 1/1] iommu/vt-d: Fix compile error with CONFIG_PCI_ATS not set

[Lu Baolu]

Fix the compile error below (CONFIG_PCI_ATS not set):

drivers/iommu/intel/dmar.c: In function ‘vf_inherit_msi_domain’:
drivers/iommu/intel/dmar.c:338:59: error: ‘struct pci_dev’ has no member named 
‘physfn’; did you mean ‘is_physfn’?
  338 |  dev_set_msi_domain(&pdev->dev, dev_get_msi_domain(&pdev->physfn->dev));
      |                                                           ^~~~~~
      |                                                           is_physfn

Link: 
https://lore.kernel.org/linux-iommu/camuhmdxa7wfjovmfsh2nbahn0cpycifhodtvg4a8hm9rx5d...@mail.gmail.com/
Fixes: ff828729be446 ("iommu/vt-d: Cure VF irqdomain hickup")
Cc: Thomas Gleixner <t...@linutronix.de>
Reported-by: Geert Uytterhoeven <ge...@linux-m68k.org>
Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
---
 drivers/iommu/intel/dmar.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index b2e804473209..11319e4dce4a 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -335,7 +335,9 @@ static void  dmar_pci_bus_del_dev(struct 
dmar_pci_notify_info *info)
 
 static inline void vf_inherit_msi_domain(struct pci_dev *pdev)
 {
-       dev_set_msi_domain(&pdev->dev, dev_get_msi_domain(&pdev->physfn->dev));
+       struct pci_dev *physfn = pci_physfn(pdev);
+
+       dev_set_msi_domain(&pdev->dev, dev_get_msi_domain(&physfn->dev));
 }
 
 static int dmar_pci_bus_notifier(struct notifier_block *nb,
-- 
2.25.1