Return-path: Received: from mailout2.w1.samsung.com ([210.118.77.12]:32512 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933862Ab3FSJ2e (ORCPT ); Wed, 19 Jun 2013 05:28:34 -0400 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout2.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MOM002PRVESDLA0@mailout2.w1.samsung.com> for linux-wireless@vger.kernel.org; Wed, 19 Jun 2013 10:28:31 +0100 (BST) Received: from CAMNPWMFITZJOH ([106.1.222.14]) by eusync1.samsung.com (Oracle Communications Messaging Server 7u4-23.01 (7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPA id <0MOM00B9FVNG3410@eusync1.samsung.com> for linux-wireless@vger.kernel.org; Wed, 19 Jun 2013 10:28:31 +0100 (BST) Reply-to: m.fitzjohn@samsung.com From: Mark Fitzjohn To: linux-wireless@vger.kernel.org Subject: mac80211: impact of netif_carrier_off during roaming Date: Wed, 19 Jun 2013 10:28:28 +0100 Message-id: <004401ce6ccf$5b69e620$123db260$%fitzjohn@samsung.com> (sfid-20130619_112839_840707_F89EB4D8) MIME-version: 1.0 Content-type: text/plain; charset=US-ASCII Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi I've noticed that during roaming triggered by detection of a significantly better AP in wpa_supplicant that mac80211 calls netif_carrier_off and then netif_carrier_on when associated with the new AP. Does this have any detrimental impact on applications using the wifi connection or is the assumption that as long as the roam happens in a reasonable time then applications should tolerate it? Just wondering if signalling the netif_carrier_off only when the current AP is lost and there is no immediate alternative AP for the network available was considered? Thanks Mark