1 files changed, 31 insertions, 4 deletions

diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
index 4a6f1a6a3aa9..6a0fca78c362 100644
--- a/arch/x86/pci/amd_bus.c
+++ b/arch/x86/pci/amd_bus.c
@@ -1,6 +1,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/topology.h>
+#include <linux/cpu.h>
 #include "pci.h"
 
 #ifdef CONFIG_X86_64
@@ -565,7 +566,7 @@ static int __init early_fill_mp_bus_info(void) { return 0; }
 
 #define ENABLE_CF8_EXT_CFG      (1ULL << 46)
 
-static void enable_pci_io_ecs_per_cpu(void *unused)
+static void enable_pci_io_ecs(void *unused)
 {
         u64 reg;
         rdmsrl(MSR_AMD64_NB_CFG, reg);
@@ -575,13 +576,39 @@ static void enable_pci_io_ecs_per_cpu(void *unused)
         }
 }
 
-static int __init enable_pci_io_ecs(void)
+static int __cpuinit amd_cpu_notify(struct notifier_block *self,
+                                    unsigned long action, void *hcpu)
 {
+        int cpu = (long)hcpu;
+        switch(action) {
+        case CPU_ONLINE:
+        case CPU_ONLINE_FROZEN:
+                smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
+                break;
+        default:
+                break;
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata amd_cpu_notifier = {
+        .notifier_call  = amd_cpu_notify,
+};
+
+static int __init pci_io_ecs_init(void)
+{
+        int cpu;
+
         /* assume all cpus from fam10h have IO ECS */
         if (boot_cpu_data.x86 < 0x10)
                 return 0;
-        on_each_cpu(enable_pci_io_ecs_per_cpu, NULL, 1);
+
+        register_cpu_notifier(&amd_cpu_notifier);
+        for_each_online_cpu(cpu)
+                amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
+                               (void *)(long)cpu);
         pci_probe |= PCI_HAS_IO_ECS;
+
         return 0;
 }
 
@@ -591,7 +618,7 @@ static int __init amd_postcore_init(void)
                 return 0;
 
         early_fill_mp_bus_info();
-        enable_pci_io_ecs();
+        pci_io_ecs_init();
 
         return 0;
 }