[POWERPC] EEH: restructure multi-function support

Rework how multi-function PCI devices are identified and traversed.
This fixes a bug with multi-function recovery on Power4 that was
introduced by a recent Power4 EEH patch.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 14 insertions, 16 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c
index f5b4f7c20d7a..8cc331eecc9d 100644
--- a/arch/powerpc/platforms/pseries/eeh_driver.c
+++ b/arch/powerpc/platforms/pseries/eeh_driver.c
@@ -249,6 +249,7 @@ static void eeh_report_failure(struct pci_dev *dev, void *userdata)
 
 static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
 {
+        struct device_node *dn;
         int cnt, rc;
 
         /* pcibios will clear the counter; save the value */
@@ -264,23 +265,20 @@ static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
         if (rc)
                 return rc;
 
-        /* New-style config addrs might be shared across multiple devices,
-         * Walk over all functions on this device */
-        if (pe_dn->eeh_pe_config_addr) {
-                struct device_node *pe = pe_dn->node;
-                pe = pe->parent->child;
-                while (pe) {
-                        struct pci_dn *ppe = PCI_DN(pe);
-                        if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) {
-                                rtas_configure_bridge(ppe);
-                                eeh_restore_bars(ppe);
-                        }
-                        pe = pe->sibling;
+        /* Walk over all functions on this device.  */
+        dn = pe_dn->node;
+        if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent))
+                dn = dn->parent->child;
+
+        while (dn) {
+                struct pci_dn *ppe = PCI_DN(dn);
+                /* On Power4, always true because eeh_pe_config_addr=0 */
+                if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) {
+                        rtas_configure_bridge(ppe);
+                        eeh_restore_bars(ppe);
                 }
-        } else {
-                rtas_configure_bridge(pe_dn);
-                eeh_restore_bars(pe_dn);
-        }
+                dn = dn->sibling;
+        }
 
         /* Give the system 5 seconds to finish running the user-space
          * hotplug shutdown scripts, e.g. ifdown for ethernet.  Yes,