diff --git a/examples/platforms/cc1352/radio.c b/examples/platforms/cc1352/radio.c
index 715afeba1..28f7a1829 100644
--- a/examples/platforms/cc1352/radio.c
+++ b/examples/platforms/cc1352/radio.c
@@ -1245,6 +1245,7 @@ otError otPlatRadioEnable(otInstance *aInstance)
         GPIO_writeDio(IOID_30, 0);
 
         sState = cc1352_stateSleep;
+        error  = OT_ERROR_NONE;
     }
 
 exit:
diff --git a/examples/platforms/cc2650/radio.c b/examples/platforms/cc2650/radio.c
index 49ee8b1c5..26411cde1 100644
--- a/examples/platforms/cc2650/radio.c
+++ b/examples/platforms/cc2650/radio.c
@@ -1170,6 +1170,7 @@ otError otPlatRadioEnable(otInstance *aInstance)
         otEXPECT_ACTION(rfCorePowerOn() == CMDSTA_Done, error = OT_ERROR_FAILED);
         otEXPECT_ACTION(rfCoreSendEnableCmd() == DONE_OK, error = OT_ERROR_FAILED);
         sState = cc2650_stateSleep;
+        error  = OT_ERROR_NONE;
     }
 
 exit:
diff --git a/examples/platforms/cc2652/radio.c b/examples/platforms/cc2652/radio.c
index 2d2422cf5..48e58370f 100644
--- a/examples/platforms/cc2652/radio.c
+++ b/examples/platforms/cc2652/radio.c
@@ -1225,6 +1225,7 @@ otError otPlatRadioEnable(otInstance *aInstance)
         otEXPECT_ACTION(rfCoreSendEnableCmd() == DONE_OK, error = OT_ERROR_FAILED);
 
         sState = cc2652_stateSleep;
+        error  = OT_ERROR_NONE;
     }
 
 exit:
diff --git a/src/core/meshcop/dataset.cpp b/src/core/meshcop/dataset.cpp
index 6b9ba3b79..e8899081d 100644
--- a/src/core/meshcop/dataset.cpp
+++ b/src/core/meshcop/dataset.cpp
@@ -48,7 +48,7 @@
 namespace ot {
 namespace MeshCoP {
 
-Dataset::Dataset(const Tlv::Type aType)
+Dataset::Dataset(Tlv::Type aType)
     : mUpdateTime(0)
     , mLength(0)
     , mType(aType)
diff --git a/src/core/meshcop/dataset_local.cpp b/src/core/meshcop/dataset_local.cpp
index d93a4be50..7b150f293 100644
--- a/src/core/meshcop/dataset_local.cpp
+++ b/src/core/meshcop/dataset_local.cpp
@@ -50,7 +50,7 @@
 namespace ot {
 namespace MeshCoP {
 
-DatasetLocal::DatasetLocal(Instance &aInstance, const Tlv::Type aType)
+DatasetLocal::DatasetLocal(Instance &aInstance, Tlv::Type aType)
     : InstanceLocator(aInstance)
     , mUpdateTime(0)
     , mType(aType)