Return-path: Received: from mail-pa0-f45.google.com ([209.85.220.45]:33679 "EHLO mail-pa0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751087AbbLTNZt (ORCPT ); Sun, 20 Dec 2015 08:25:49 -0500 Received: by mail-pa0-f45.google.com with SMTP id cy9so3381678pac.0 for ; Sun, 20 Dec 2015 05:25:49 -0800 (PST) From: Fengwei Yin To: julian.calaby@gmail.com, linux-wireless@vger.kernel.org, wcn36xx@lists.infradead.org, me@bobcopeland.com, k.eugene.e@gmail.com, bjorn.andersson@sonymobile.com Cc: fengwei.yin@linaro.org, lking@qti.qualcomm.com Subject: [PATCH v3 0/2] wcn36xx: fix crash because rx skb allocation failure Date: Sun, 20 Dec 2015 21:20:39 +0800 Message-Id: <1450617641-29531-1-git-send-email-fengwei.yin@linaro.org> (sfid-20151220_142553_521403_B0013885) Sender: linux-wireless-owner@vger.kernel.org List-ID: The current wcn36xx driver didn't handle rx skb allocation failure case. It only could be triggered when system is in extremly memory shortage case. King Lawrence hit it by git clone linux kernel tree on DragonBoard <1>. The fixing is not to submit the old rx skb to network upper layer and reuse it as rx DMA buffer again. Changes from v2: * Remove the ugly macro introduced in v2 per comment from Julian Calaby. * Seperate the DMA int mask register writing as one patch per comment from Bjorn Andersson. Changes from v1: * Move switch block out of while loop. * Remove the warning of unknown channel because we didn't deal with it. Fengwei Yin (2): wcn36xx: handle rx skb allocation failure to avoid system crash wcn36xx: split DMA mask register writing. drivers/net/wireless/ath/wcn36xx/dxe.c | 43 +++++++++++++++++----------------- 1 file changed, 22 insertions(+), 21 deletions(-) -- 2.1.4