iwlwifi: mvm: only release the trans ref if d0i3 is supported in fw

If d0i3 is not supported by the firmware (or if it's disabled via
module parameters) we shouldn't release the initial transport
reference, so that we won't enter runtime suspend.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/ops.c

@@ -672,8 +672,10 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 
 	memset(&mvm->rx_stats, 0, sizeof(struct mvm_statistics_rx));
 
-	/* rpm starts with a taken reference, we can release it now */
-	iwl_trans_unref(mvm->trans);
+	/* The transport always starts with a taken reference, we can
+	 * release it now if d0i3 is supported */
+	if (iwl_mvm_is_d0i3_supported(mvm))
+		iwl_trans_unref(mvm->trans);
 
 	iwl_mvm_tof_init(mvm);