powerpc/eeh: Remove eeh device from OF node

Originally, the PCI sensitive OF node is tracing the eeh device
through struct device_node->edev. However, it was regarded as
bad idea.

The patch removes struct device_node->edev and uses PCI_DN to
trace the corresponding eeh device according to BenH's comments.
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/pci-bridge.h

@@ -155,6 +155,7 @@ struct pci_dn {
 
 	struct	pci_dev *pcidev;	/* back-pointer to the pci device */
 #ifdef CONFIG_EEH
+	struct eeh_dev *edev;		/* eeh device */
 	int	class_code;		/* pci device class */
 	int	eeh_mode;		/* See eeh.h for possible EEH_MODEs */
 	int	eeh_config_addr;
@@ -185,6 +186,13 @@ static inline int pci_device_from_OF_node(struct device_node *np,
 	return 0;
 }
 
+#if defined(CONFIG_EEH)
+static inline struct eeh_dev *of_node_to_eeh_dev(struct device_node *dn)
+{
+	return PCI_DN(dn)->edev;
+}
+#endif
+
 /** Find the bus corresponding to the indicated device node */
 extern struct pci_bus *pcibios_find_pci_bus(struct device_node *dn);
 

arch/powerpc/platforms/pseries/eeh_dev.c

@@ -62,7 +62,7 @@ void * __devinit eeh_dev_init(struct device_node *dn, void *data)
 	}
 
 	/* Associate EEH device with OF node */
-	dn->edev  = edev;
+	PCI_DN(dn)->edev = edev;
 	edev->dn  = dn;
 	edev->phb = phb;
 

include/linux/of.h

@@ -58,9 +58,6 @@ struct device_node {
 	struct	kref kref;
 	unsigned long _flags;
 	void	*data;
-#if defined(CONFIG_EEH)
-	struct eeh_dev *edev;
-#endif
 #if defined(CONFIG_SPARC)
 	char	*path_component_name;
 	unsigned int unique_id;
@@ -75,13 +72,6 @@ struct of_phandle_args {
 	uint32_t args[MAX_PHANDLE_ARGS];
 };
 
-#if defined(CONFIG_EEH)
-static inline struct eeh_dev *of_node_to_eeh_dev(struct device_node *dn)
-{
-	return dn->edev;
-}
-#endif
-
 #ifdef CONFIG_OF_DYNAMIC
 extern struct device_node *of_node_get(struct device_node *node);
 extern void of_node_put(struct device_node *node);