Merge pull request #10151 from kjbracey-arm/sleepmgr_optimise

Sleep manager: optimise counter

Author: Cruz Monrreal

platform/mbed_sleep_manager.c

@@ -25,7 +25,6 @@
 #include "hal/us_ticker_api.h"
 #include "hal/lp_ticker_api.h"
 
-#include <limits.h>
 #include <stdio.h>
 
 #if DEVICE_SLEEP
@@ -173,29 +172,21 @@ void sleep_tracker_unlock(const char *const filename, int line)
 
 void sleep_manager_lock_deep_sleep_internal(void)
 {
-    core_util_critical_section_enter();
-    if (deep_sleep_lock == USHRT_MAX) {
-        core_util_critical_section_exit();
-        MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_HAL, MBED_ERROR_CODE_OVERFLOW), "DeepSleepLock overflow (> USHRT_MAX)", deep_sleep_lock);
+    if (core_util_atomic_incr_u16(&deep_sleep_lock, 1) == 0) {
+        MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_HAL, MBED_ERROR_CODE_OVERFLOW), "DeepSleepLock overflow (> 0xFFFF)", deep_sleep_lock);
     }
-    core_util_atomic_incr_u16(&deep_sleep_lock, 1);
-    core_util_critical_section_exit();
 }
 
 void sleep_manager_unlock_deep_sleep_internal(void)
 {
-    core_util_critical_section_enter();
-    if (deep_sleep_lock == 0) {
-        core_util_critical_section_exit();
+    if (core_util_atomic_decr_u16(&deep_sleep_lock, 1) == 0xFFFF) {
         MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_HAL, MBED_ERROR_CODE_UNDERFLOW), "DeepSleepLock underflow (< 0)", deep_sleep_lock);
     }
-    core_util_atomic_decr_u16(&deep_sleep_lock, 1);
-    core_util_critical_section_exit();
 }
 
 bool sleep_manager_can_deep_sleep(void)
 {
-    return deep_sleep_lock == 0 ? true : false;
+    return core_util_atomic_load_u16(&deep_sleep_lock) == 0;
 }
 
 bool sleep_manager_can_deep_sleep_test_check()