From 1663ca8590bfa21a8041d81368db726deb573e2e Mon Sep 17 00:00:00 2001
From: Flavio Ceolin <flavio.ceolin@intel.com>
Date: Tue, 11 Sep 2018 19:32:59 -0700
Subject: [PATCH] kernel: Ignore _pend_current_thread return in some cases

There are some cases that there is nothing to do with
_pend_current_thread() return (that is _Swap return value).

As MISRA-C requires that all non-void functions have their
return value checked, we are explicitly ignoring it when there is
nothing to do.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
---
 kernel/mempool.c | 2 +-
 kernel/pipes.c   | 4 ++--
 kernel/timer.c   | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/mempool.c b/kernel/mempool.c
index a08412bb6dd..3817e4e56a6 100644
--- a/kernel/mempool.c
+++ b/kernel/mempool.c
@@ -91,7 +91,7 @@ int k_mem_pool_alloc(struct k_mem_pool *p, struct k_mem_block *block,
 			return ret;
 		}
 
-		_pend_current_thread(irq_lock(), &p->wait_q, timeout);
+		(void)_pend_current_thread(irq_lock(), &p->wait_q, timeout);
 
 		if (timeout != K_FOREVER) {
 			timeout = end - _tick_get();
diff --git a/kernel/pipes.c b/kernel/pipes.c
index 65c195ec06e..dba680699b4 100644
--- a/kernel/pipes.c
+++ b/kernel/pipes.c
@@ -565,7 +565,7 @@ int _k_pipe_put_internal(struct k_pipe *pipe, struct k_pipe_async *async_desc,
 		 */
 		key = irq_lock();
 		_sched_unlock_no_reschedule();
-		_pend_current_thread(key, &pipe->wait_q.writers, timeout);
+		(void)_pend_current_thread(key, &pipe->wait_q.writers, timeout);
 	} else {
 		k_sched_unlock();
 	}
@@ -707,7 +707,7 @@ int _impl_k_pipe_get(struct k_pipe *pipe, void *data, size_t bytes_to_read,
 		_current->base.swap_data = &pipe_desc;
 		key = irq_lock();
 		_sched_unlock_no_reschedule();
-		_pend_current_thread(key, &pipe->wait_q.readers, timeout);
+		(void)_pend_current_thread(key, &pipe->wait_q.readers, timeout);
 	} else {
 		k_sched_unlock();
 	}
diff --git a/kernel/timer.c b/kernel/timer.c
index 037599755a0..41402f23f9f 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -206,7 +206,7 @@ u32_t _impl_k_timer_status_sync(struct k_timer *timer)
 	if (result == 0) {
 		if (timer->timeout.delta_ticks_from_prev != _INACTIVE) {
 			/* wait for timer to expire or stop */
-			_pend_current_thread(key, &timer->wait_q, K_FOREVER);
+			(void)_pend_current_thread(key, &timer->wait_q, K_FOREVER);
 
 			/* get updated timer status */
 			key = irq_lock();