[media] wm8775: Revert changeset fcb9757333 to avoid a regression
[linux-2.6.git] / kernel / watchdog.c
index 7f9c3c5..6e3c41a 100644 (file)
@@ -43,8 +43,7 @@ static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
 static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
 #endif
 
-static int __read_mostly did_panic;
-static int __initdata no_watchdog;
+static int no_watchdog;
 
 
 /* boot commands */
@@ -187,18 +186,6 @@ static int is_softlockup(unsigned long touch_ts)
        return 0;
 }
 
-static int
-watchdog_panic(struct notifier_block *this, unsigned long event, void *ptr)
-{
-       did_panic = 1;
-
-       return NOTIFY_DONE;
-}
-
-static struct notifier_block panic_block = {
-       .notifier_call = watchdog_panic,
-};
-
 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 static struct perf_event_attr wd_hw_attr = {
        .type           = PERF_TYPE_HARDWARE,
@@ -209,7 +196,7 @@ static struct perf_event_attr wd_hw_attr = {
 };
 
 /* Callback function for perf event subsystem */
-void watchdog_overflow_callback(struct perf_event *event, int nmi,
+static void watchdog_overflow_callback(struct perf_event *event, int nmi,
                 struct perf_sample_data *data,
                 struct pt_regs *regs)
 {
@@ -371,14 +358,14 @@ static int watchdog_nmi_enable(int cpu)
        /* Try to register using hardware perf events */
        wd_attr = &wd_hw_attr;
        wd_attr->sample_period = hw_nmi_get_sample_period();
-       event = perf_event_create_kernel_counter(wd_attr, cpu, -1, watchdog_overflow_callback);
+       event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback);
        if (!IS_ERR(event)) {
                printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n");
                goto out_save;
        }
 
        printk(KERN_ERR "NMI watchdog failed to create perf event on cpu%i: %p\n", cpu, event);
-       return -1;
+       return PTR_ERR(event);
 
        /* success path */
 out_save:
@@ -422,17 +409,19 @@ static int watchdog_prepare_cpu(int cpu)
 static int watchdog_enable(int cpu)
 {
        struct task_struct *p = per_cpu(softlockup_watchdog, cpu);
+       int err;
 
        /* enable the perf event */
-       if (watchdog_nmi_enable(cpu) != 0)
-               return -1;
+       err = watchdog_nmi_enable(cpu);
+       if (err)
+               return err;
 
        /* create the watchdog thread */
        if (!p) {
                p = kthread_create(watchdog, (void *)(unsigned long)cpu, "watchdog/%d", cpu);
                if (IS_ERR(p)) {
                        printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
-                       return -1;
+                       return PTR_ERR(p);
                }
                kthread_bind(p, cpu);
                per_cpu(watchdog_touch_ts, cpu) = 0;
@@ -484,6 +473,9 @@ static void watchdog_disable_all_cpus(void)
 {
        int cpu;
 
+       if (no_watchdog)
+               return;
+
        for_each_online_cpu(cpu)
                watchdog_disable(cpu);
 
@@ -526,17 +518,16 @@ static int __cpuinit
 cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
 {
        int hotcpu = (unsigned long)hcpu;
+       int err = 0;
 
        switch (action) {
        case CPU_UP_PREPARE:
        case CPU_UP_PREPARE_FROZEN:
-               if (watchdog_prepare_cpu(hotcpu))
-                       return NOTIFY_BAD;
+               err = watchdog_prepare_cpu(hotcpu);
                break;
        case CPU_ONLINE:
        case CPU_ONLINE_FROZEN:
-               if (watchdog_enable(hotcpu))
-                       return NOTIFY_BAD;
+               err = watchdog_enable(hotcpu);
                break;
 #ifdef CONFIG_HOTPLUG_CPU
        case CPU_UP_CANCELED:
@@ -549,7 +540,7 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                break;
 #endif /* CONFIG_HOTPLUG_CPU */
        }
-       return NOTIFY_OK;
+       return notifier_from_errno(err);
 }
 
 static struct notifier_block __cpuinitdata cpu_nfb = {
@@ -565,13 +556,11 @@ static int __init spawn_watchdog_task(void)
                return 0;
 
        err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
-       WARN_ON(err == NOTIFY_BAD);
+       WARN_ON(notifier_to_errno(err));
 
        cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
        register_cpu_notifier(&cpu_nfb);
 
-       atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
-
        return 0;
 }
 early_initcall(spawn_watchdog_task);