MIPS: Oprofile: Fixup of loongson2_exit()

When exiting from loongson2_exit(), we need to reset the counter
register too, this patch adds a function reset_counters() to do it, by
the way, this function will be shared by Perf.
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1199/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/oprofile/op_model_loongson2.c

@@ -43,6 +43,12 @@ static struct loongson2_register_config {
 static char *oprofid = "LoongsonPerf";
 static irqreturn_t loongson2_perfcount_handler(int irq, void *dev_id);
 
+static void reset_counters(void *arg)
+{
+	write_c0_perfctrl(0);
+	write_c0_perfcnt(0);
+}
+
 static void loongson2_reg_setup(struct op_counter_config *cfg)
 {
 	unsigned int ctrl = 0;
@@ -139,7 +145,7 @@ static int __init loongson2_init(void)
 
 static void loongson2_exit(void)
 {
-	write_c0_perfctrl(0);
+	reset_counters(NULL);
 	free_irq(LOONGSON2_PERFCNT_IRQ, oprofid);
 }