iommu: Move swap_pci_ref function to drivers/iommu/pci.h.

The swap_pci_ref function is used by the IOMMU API code for
swapping pci device pointers, while determining the iommu
group for the device.
Currently this function was being implemented for different
IOMMU drivers.  This patch moves the function to a new file,
drivers/iommu/pci.h so that the implementation can be
shared across various IOMMU drivers.

Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0099667a397e..88329fa13634 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -47,6 +47,7 @@
 #include <asm/iommu.h>
 
 #include "irq_remapping.h"
+#include "pci.h"
 
 #define ROOT_SIZE               VTD_PAGE_SIZE
 #define CONTEXT_SIZE            VTD_PAGE_SIZE
@@ -4137,12 +4138,6 @@ static int intel_iommu_domain_has_cap(struct iommu_domain *domain,
         return 0;
 }
 
-static void swap_pci_ref(struct pci_dev **from, struct pci_dev *to)
-{
-        pci_dev_put(*from);
-        *from = to;
-}
-
 #define REQ_ACS_FLAGS   (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
 
 static int intel_iommu_add_device(struct device *dev)