From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE84BC43381 for ; Wed, 27 Feb 2019 16:28:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8A6872184A for ; Wed, 27 Feb 2019 16:28:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b="msSR8KPg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729907AbfB0Q2C (ORCPT ); Wed, 27 Feb 2019 11:28:02 -0500 Received: from mail2.candelatech.com ([208.74.158.173]:34828 "EHLO mail2.candelatech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726783AbfB0Q2C (ORCPT ); Wed, 27 Feb 2019 11:28:02 -0500 Received: from ben-dt4.candelatech.com (firewall.candelatech.com [50.251.239.81]) by mail2.candelatech.com (Postfix) with ESMTP id C898B40A5CB; Wed, 27 Feb 2019 08:27:59 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 mail2.candelatech.com C898B40A5CB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=candelatech.com; s=default; t=1551284879; bh=fIKB+NSf2zXTj3lS4e9EF1OHbO9lzoOEYy/BpNkpdHI=; h=From:To:Cc:Subject:Date:From; b=msSR8KPgo3brjTFbKX56jv3/AJxtLsy+y1g6P+AZI3y4PxACOQK6ioROzPS06h5Ax FY6ydkQZmmBPcAQVrOSiehxg3SPIAU5H9O3/QOSgOhxlJWkmSVaNsU9d3DW+UQD1F8 apwmp6nVrA8InvbmsfPOtkDY+ojBUS9zK0MJwtFs= From: greearb@candelatech.com To: linux-wireless@vger.kernel.org Cc: Ben Greear Subject: [PATCH] ath10k: Free beacon buf later in vdev teardown. Date: Wed, 27 Feb 2019 08:27:56 -0800 Message-Id: <20190227162756.13048-1-greearb@candelatech.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Ben Greear My wave-1 firmware often crashes when I am bringing down AP vdevs, and sometimes at least some machines lockup hard after spewing IOMMU errors. I don't see the same issue in STA mode, so I suspect beacons are the issue. Moving the beacon buf deletion to later in the vdev teardown logic appears to help this problem. Firmware still crashes often, but several iterations did not show IOMMU errors and machine didn't hang. Signed-off-by: Ben Greear --- drivers/net/wireless/ath/ath10k/mac.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index f70c48ec9464..c38561788791 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -6142,10 +6142,6 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw, mutex_lock(&ar->conf_mutex); - spin_lock_bh(&ar->data_lock); - ath10k_mac_vif_beacon_cleanup(arvif); - spin_unlock_bh(&ar->data_lock); - ret = ath10k_spectral_vif_stop(arvif); if (ret) ath10k_warn(ar, "failed to stop spectral for vdev %i: %d\n", @@ -6204,6 +6200,10 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw, peer->vif = NULL; } } + + /* Clean this up late, less opportunity for firmware to access + DMA memory we have deleted. */ + ath10k_mac_vif_beacon_cleanup(arvif); spin_unlock_bh(&ar->data_lock); ath10k_peer_cleanup(ar, arvif->vdev_id); -- 2.20.1