powerpc/eeh: Remove reference to PCI device

We will rely on pcibios_release_device() to remove the EEH cache
and unbind EEH device for the specific PCI device. So we shouldn't
hold the reference to the PCI device from EEH cache and EEH device.
Otherwise, pcibios_release_device() won't be called as we expected.
The patch removes the reference to the PCI device in EEH core.
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/eeh.c

@@ -499,8 +499,6 @@ unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned lon
 	}
 
 	eeh_dev_check_failure(edev);
-
-	pci_dev_put(eeh_dev_to_pci_dev(edev));
 	return val;
 }
 
@@ -904,7 +902,6 @@ static void eeh_add_device_late(struct pci_dev *dev)
 	}
 	WARN_ON(edev->pdev);
 
-	pci_dev_get(dev);
 	edev->pdev = dev;
 	dev->dev.archdata.edev = edev;
 
@@ -992,7 +989,6 @@ static void eeh_remove_device(struct pci_dev *dev, int purge_pe)
 	}
 	edev->pdev = NULL;
 	dev->dev.archdata.edev = NULL;
-	pci_dev_put(dev);
 
 	eeh_rmv_from_parent_pe(edev, purge_pe);
 	eeh_addr_cache_rmv_dev(dev);

arch/powerpc/kernel/eeh_cache.c

@@ -68,16 +68,12 @@ static inline struct eeh_dev *__eeh_addr_cache_get_device(unsigned long addr)
 		struct pci_io_addr_range *piar;
 		piar = rb_entry(n, struct pci_io_addr_range, rb_node);
 
-		if (addr < piar->addr_lo) {
+		if (addr < piar->addr_lo)
 			n = n->rb_left;
-		} else {
-			if (addr > piar->addr_hi) {
-				n = n->rb_right;
-			} else {
-				pci_dev_get(piar->pcidev);
-				return piar->edev;
-			}
-		}
+		else if (addr > piar->addr_hi)
+			n = n->rb_right;
+		else
+			return piar->edev;
 	}
 
 	return NULL;
@@ -156,7 +152,6 @@ eeh_addr_cache_insert(struct pci_dev *dev, unsigned long alo,
 	if (!piar)
 		return NULL;
 
-	pci_dev_get(dev);
 	piar->addr_lo = alo;
 	piar->addr_hi = ahi;
 	piar->edev = pci_dev_to_eeh_dev(dev);
@@ -250,7 +245,6 @@ static inline void __eeh_addr_cache_rmv_dev(struct pci_dev *dev)
 
 		if (piar->pcidev == dev) {
 			rb_erase(n, &pci_io_addr_cache_root.rb_root);
-			pci_dev_put(piar->pcidev);
 			kfree(piar);
 			goto restart;
 		}
@@ -302,12 +296,10 @@ void eeh_addr_cache_build(void)
 		if (!edev)
 			continue;
 
-		pci_dev_get(dev);  /* matching put is in eeh_remove_device() */
 		dev->dev.archdata.edev = edev;
 		edev->pdev = dev;
 
 		eeh_addr_cache_insert_dev(dev);
-
 		eeh_sysfs_add_device(dev);
 	}