Return-path: Received: from mail-pd0-f172.google.com ([209.85.192.172]:34738 "EHLO mail-pd0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751017AbaILD5t convert rfc822-to-8bit (ORCPT ); Thu, 11 Sep 2014 23:57:49 -0400 Received: by mail-pd0-f172.google.com with SMTP id v10so307908pde.3 for ; Thu, 11 Sep 2014 20:57:48 -0700 (PDT) Received: from [147.46.243.214] ([147.46.243.214]) by mx.google.com with ESMTPSA id wc5sm2578789pab.2.2014.09.11.20.57.47 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Thu, 11 Sep 2014 20:57:47 -0700 (PDT) Date: Fri, 12 Sep 2014 12:57:44 +0900 From: Okhwan Lee To: linux-wireless@vger.kernel.org Message-ID: <013176138105415386E2ECF0674E546E@mwnl.snu.ac.kr> (sfid-20140912_055752_567486_F3A3D659) Subject: Set channel (freq) and bandwidth (BW) using iw command MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi, I have a simple problem (?), but I cannot find any answer in google and wireless.kerner.org. I use 3.16.1 kernel/backport version with ath10k/QCA9880. I want to handle freq/BW to test its performance. When I change center frequency and BW by using iw command, linux reports “command failed: Device or resource busy (-16)” as follows. $ modprobe ath10k_pci $ iw wlan0 set channel 36 HT20 command failed: Device or resource busy (-16) $ iw wlan0 set freq 5180 40 5190 command failed: Device or resource busy (-16) $ iw wlan0 set freq 5180 80 5210 command failed: Device or resource busy (-16) Curiously if anyone else has solution for this problem? Thank you. -- Okhwan Lee