powerpc/powernv/idoa: Remove unnecessary pcidev from pci_dn

The pcidev value stored in pci_dn is only used for NPU/NPU2
initialization. We can easily drop the cached pointer and
use an ancient helper - pci_get_domain_bus_and_slot() instead in order
to reduce complexity.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

3 files changed, 4 insertions, 6 deletions

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index b98a44667333..94d449031b18 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -197,8 +197,6 @@ struct pci_dn {
         struct  iommu_table_group *table_group; /* for phb's or bridges */
 
         int     pci_ext_config_space;   /* for pci devices */
-
-        struct  pci_dev *pcidev;        /* back-pointer to the pci device */
 #ifdef CONFIG_EEH
         struct eeh_dev *edev;           /* eeh device */
 #endif
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index c5899c107d59..0a253b64ac5f 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -39,7 +39,10 @@
  */
 static struct pci_dev *get_pci_dev(struct device_node *dn)
 {
-        return PCI_DN(dn)->pcidev;
+        struct pci_dn *pdn = PCI_DN(dn);
+
+        return pci_get_domain_bus_and_slot(pci_domain_nr(pdn->phb->bus),
+                                           pdn->busno, pdn->devfn);
 }
 
 /* Given a NPU device get the associated PCI device. */
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 886014ed85fe..398cc5e4b91b 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1082,7 +1082,6 @@ static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
          * At some point we want to remove the PDN completely anyways
          */
         pci_dev_get(dev);
-        pdn->pcidev = dev;
         pdn->pe_number = pe->pe_number;
         pe->flags = PNV_IODA_PE_DEV;
         pe->pdev = dev;
@@ -1129,7 +1128,6 @@ static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe)
                         continue;
 
                 pe->device_count++;
-                pdn->pcidev = dev;
                 pdn->pe_number = pe->pe_number;
                 if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
                         pnv_ioda_setup_same_PE(dev->subordinate, pe);
@@ -1244,7 +1242,6 @@ static struct pnv_ioda_pe *pnv_ioda_setup_npu_PE(struct pci_dev *npu_pdev)
                         pci_dev_get(npu_pdev);
                         npu_pdn = pci_get_pdn(npu_pdev);
                         rid = npu_pdev->bus->number << 8 | npu_pdn->devfn;
-                        npu_pdn->pcidev = npu_pdev;
                         npu_pdn->pe_number = pe_num;
                         phb->ioda.pe_rmap[rid] = pe->pe_number;