Tried with this code, still not saving the record.

<apex:page standardcontroller="IO_Line__c" recordSetVar="iolines" extensions="iolineController" >
<apex:form >
     <apex:pageBlock mode="inlineEdit" id="pb">
        <apex:pageBlockTable value="{!iolines}" var="line">
         <apex:column value="{!line.id}"/>
            <apex:column headerValue="Name">
              <apex:outputField value="{!line.Name}" />
            </apex:column>  
         </apex:pageBlockTable>
      </apex:pageBlock>
<apex:commandButton value="Save" action="{!save}" />
</apex:form>        
</apex:page>


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public class iolineController {

    ApexPages.StandardSetController controller;
    public iolineController(ApexPages.StandardSetController controller) {
     channelIOId= ApexPages.CurrentPage().getParameters().get('chId');
        this.controller = new ApexPages.StandardSetController(Database.getQueryLocator(
                   [Select i.Name, i.Id  From IO_Line__c i where i.Channel_IO__c=:channelIOId  ]));
       
        }

    public List<io_Line__c> getIolines() {
        return (List<io_Line__c>) controller.getRecords();
    }
     public string channelIOId;
    public PageReference save() {
 
        try{
             controller.save();
         }
         catch (Exception e){
           System.debug('e:'+e);
         }  
         return null;    
}
   

}