mgmt: mcumgr: use delayed workqueue for reset

Same behaviour, less code, smaller code size.

Signed-off-by: Nick Ward <nix.ward@gmail.com>

subsys/mgmt/mcumgr/grp/os_mgmt/src/os_mgmt.c

@@ -59,10 +59,8 @@ LOG_MODULE_REGISTER(mcumgr_os_grp, CONFIG_MCUMGR_GRP_OS_LOG_LEVEL);
 
 #ifdef CONFIG_REBOOT
 static void os_mgmt_reset_work_handler(struct k_work *work);
-static void os_mgmt_reset_cb(struct k_timer *timer);
 
-K_WORK_DEFINE(os_mgmt_reset_work, os_mgmt_reset_work_handler);
-static K_TIMER_DEFINE(os_mgmt_reset_timer, os_mgmt_reset_cb, NULL);
+K_WORK_DELAYABLE_DEFINE(os_mgmt_reset_work, os_mgmt_reset_work_handler);
 #endif
 
 /* This is passed to zcbor_map_start/end_endcode as a number of
@@ -358,13 +356,9 @@ static int os_mgmt_taskstat_read(struct smp_streamer *ctxt)
  */
 static void os_mgmt_reset_work_handler(struct k_work *work)
 {
-	sys_reboot(SYS_REBOOT_WARM);
-}
+	ARG_UNUSED(work);
 
-static void os_mgmt_reset_cb(struct k_timer *timer)
-{
-	/* Reboot the system from the system workqueue thread. */
-	k_work_submit(&os_mgmt_reset_work);
+	sys_reboot(SYS_REBOOT_WARM);
 }
 
 static int os_mgmt_reset(struct smp_streamer *ctxt)
@@ -404,8 +398,9 @@ static int os_mgmt_reset(struct smp_streamer *ctxt)
 	}
 #endif
 
-	k_timer_start(&os_mgmt_reset_timer, K_MSEC(CONFIG_MCUMGR_GRP_OS_RESET_MS),
-		      K_NO_WAIT);
+	/* Reboot the system from the system workqueue thread. */
+	k_work_schedule(&os_mgmt_reset_work, K_MSEC(CONFIG_MCUMGR_GRP_OS_RESET_MS));
+
 	return 0;
 }
 #endif