[PATCH rtems] bsps/arm: Fix uninitialized value in generic timer

[Christian Mauderer]

_CPU_Counter_frequency() can be called by the rtems_counter
initialization before arm_gt_clock_initialize() initializes the value
used in _CPU_Counter_frequency().

Update #3456.
---
 bsps/arm/shared/clock/clock-generic-timer.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/bsps/arm/shared/clock/clock-generic-timer.c b/bsps/arm/shared/clock/clock-generic-timer.c
index 1f39632ba6..a0efb9c7ed 100644
--- a/bsps/arm/shared/clock/clock-generic-timer.c
+++ b/bsps/arm/shared/clock/clock-generic-timer.c
@@ -161,7 +161,6 @@ static void arm_gt_clock_initialize(void)
   tc = &arm_gt_clock_instance.tc;
   tc->tc_get_timecount = arm_gt_clock_get_timecount;
   tc->tc_counter_mask = 0xffffffff;
-  tc->tc_frequency = frequency;
   tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
   rtems_timecounter_install(tc);
 }
@@ -178,12 +177,19 @@ CPU_Counter_ticks _CPU_Counter_read(void)
 
 static void arm_gt_clock_early_init(void)
 {
+  uint32_t frequency;
   arm_gt_clock_set_control(0x3);
 
   arm_generic_timer_get_config(
-    &arm_gt_clock_instance.interval,
+    &frequency,
     &arm_gt_clock_instance.irq
   );
+
+  /* Used by _CPU_Counter_frequency before arm_gt_clock_initialize is called */
+  arm_gt_clock_instance.tc.tc_frequency = frequency;
+
+  /* overwritten with the calculated interval by arm_gt_clock_initialize */
+  arm_gt_clock_instance.interval = frequency;
 }
 
 RTEMS_SYSINIT_ITEM(
-- 
2.16.4