Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc64: Fix Niagara2 perf event handling.
  sparc64: Fix NMI programming when perf events are active.
  bbc_envctrl: Clean up properly if kthread_run() fails.

3 files changed, 51 insertions, 27 deletions

diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index f30f4a1ead2..d242a734054 100644
--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -96,7 +96,6 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
 	int cpu = smp_processor_id();
 
 	clear_softint(1 << irq);
-	pcr_ops->write(PCR_PIC_PRIV);
 
 	local_cpu_data().__nmi_count++;
 
@@ -105,6 +104,8 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
 	if (notify_die(DIE_NMI, "nmi", regs, 0,
 		       pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP)
 		touched = 1;
+	else
+		pcr_ops->write(PCR_PIC_PRIV);
 
 	sum = kstat_irqs_cpu(0, cpu);
 	if (__get_cpu_var(nmi_touch)) {
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index fa5936e1c3b..198fb4e79ba 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -986,6 +986,17 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
 	data.addr = 0;
 
 	cpuc = &__get_cpu_var(cpu_hw_events);
+
+	/* If the PMU has the TOE IRQ enable bits, we need to do a
+	 * dummy write to the %pcr to clear the overflow bits and thus
+	 * the interrupt.
+	 *
+	 * Do this before we peek at the counters to determine
+	 * overflow so we don't lose any events.
+	 */
+	if (sparc_pmu->irq_bit)
+		pcr_ops->write(cpuc->pcr);
+
 	for (idx = 0; idx < MAX_HWEVENTS; idx++) {
 		struct perf_event *event = cpuc->events[idx];
 		struct hw_perf_event *hwc;
diff --git a/drivers/sbus/char/bbc_envctrl.c b/drivers/sbus/char/bbc_envctrl.c
index 7c815d3327f..28d86f9df83 100644
--- a/drivers/sbus/char/bbc_envctrl.c
+++ b/drivers/sbus/char/bbc_envctrl.c
@@ -522,6 +522,40 @@ static void attach_one_fan(struct bbc_i2c_bus *bp, struct of_device *op,
 	set_fan_speeds(fp);
 }
 
+static void destroy_one_temp(struct bbc_cpu_temperature *tp)
+{
+	bbc_i2c_detach(tp->client);
+	kfree(tp);
+}
+
+static void destroy_all_temps(struct bbc_i2c_bus *bp)
+{
+	struct bbc_cpu_temperature *tp, *tpos;
+
+	list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {
+		list_del(&tp->bp_list);
+		list_del(&tp->glob_list);
+		destroy_one_temp(tp);
+	}
+}
+
+static void destroy_one_fan(struct bbc_fan_control *fp)
+{
+	bbc_i2c_detach(fp->client);
+	kfree(fp);
+}
+
+static void destroy_all_fans(struct bbc_i2c_bus *bp)
+{
+	struct bbc_fan_control *fp, *fpos;
+
+	list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {
+		list_del(&fp->bp_list);
+		list_del(&fp->glob_list);
+		destroy_one_fan(fp);
+	}
+}
+
 int bbc_envctrl_init(struct bbc_i2c_bus *bp)
 {
 	struct of_device *op;
@@ -541,6 +575,8 @@ int bbc_envctrl_init(struct bbc_i2c_bus *bp)
 			int err = PTR_ERR(kenvctrld_task);
 
 			kenvctrld_task = NULL;
+			destroy_all_temps(bp);
+			destroy_all_fans(bp);
 			return err;
 		}
 	}
@@ -548,35 +584,11 @@ int bbc_envctrl_init(struct bbc_i2c_bus *bp)
 	return 0;
 }
 
-static void destroy_one_temp(struct bbc_cpu_temperature *tp)
-{
-	bbc_i2c_detach(tp->client);
-	kfree(tp);
-}
-
-static void destroy_one_fan(struct bbc_fan_control *fp)
-{
-	bbc_i2c_detach(fp->client);
-	kfree(fp);
-}
-
 void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp)
 {
-	struct bbc_cpu_temperature *tp, *tpos;
-	struct bbc_fan_control *fp, *fpos;
-
 	if (kenvctrld_task)
 		kthread_stop(kenvctrld_task);
 
-	list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {
-		list_del(&tp->bp_list);
-		list_del(&tp->glob_list);
-		destroy_one_temp(tp);
-	}
-
-	list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {
-		list_del(&fp->bp_list);
-		list_del(&fp->glob_list);
-		destroy_one_fan(fp);
-	}
+	destroy_all_temps(bp);
+	destroy_all_fans(bp);
 }