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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A40ABC433FE for ; Tue, 18 Jan 2022 03:31:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=06tf45Gm26Z05s44PIV5k8TtJrlbT5FiTWtoUarrlAw=; b=mR7x/For6JrogY fPdVou3Wt0aRMElenCQJpS9pTSjdFLor0uoo4yW7lxQdyFQkTFHZz8h9pa4r5bZLRe9Nd5ipRevdO hObtsvHe80por2NOlu3504RLkkb8xyxFrMpn+9y+RNg+xDyjKwwRGc+7Mh374ssIBmJJZsD5mXxTc kRr+yA+u4uZ/xTsHpxwO39BaBta+I5drACf4oywDMV/5RBjCud89ivgR/d9u1fscoyw4hpng6Fbwm M1kHV8vNvLNeFZQD9nr5w34XzLNq+mqOfpJDLMCaXbbXyPFaqN/4QMjPf/gKBpk85YtRlouj3jqAJ EnygAoJB7E5LcKpR2JMA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n9fD5-00HTZx-R2; Tue, 18 Jan 2022 03:31:04 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1n9eXG-00H7DR-Td for ath10k@lists.infradead.org; Tue, 18 Jan 2022 02:47:52 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8940AB81229; Tue, 18 Jan 2022 02:47:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31274C36AF4; Tue, 18 Jan 2022 02:47:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642474067; bh=jLeeFf393B8HjgrocufcT+n/GYkXVkQ4rnUo38UVcLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GAcWqjAGUNwg2PHfrap6SgbqUzShHzx6hbhk4KwMIVN6clMlN67ODTH5e0MZxg/f6 old2LJMZvySbtvNzsZAaRWqFoSQHZ7TMPzyW7LHKGY9lJTvF9Jy4+2xUzbG2R3uvfI D29yyAdW0zESYls0UQZrtcg9ZwDeumH2LnrSpbTijpMrfExXb7xJPVcIEd0AigDkvm TAzTXTw3Ik891lgkuLiyoM/SS2G0axqLWnQQ5cxtt6two9WZMU0BEOGzozEgVKqXYT bqR8ARNwe9M/N/FPGxPnFS4gQuUEUWP37y+PuLU6GpcNRicj5zaYjy0nvelE+7x7HQ eHSXtLdp64kPA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sebastian Gottschall , Kalle Valo , Sasha Levin , kvalo@kernel.org, davem@davemloft.net, kuba@kernel.org, ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 21/59] ath10k: Fix tx hanging Date: Mon, 17 Jan 2022 21:46:22 -0500 Message-Id: <20220118024701.1952911-21-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220118024701.1952911-1-sashal@kernel.org> References: <20220118024701.1952911-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220117_184751_143006_B1DFB11F X-CRM114-Status: GOOD ( 11.63 ) X-BeenThere: ath10k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath10k" Errors-To: ath10k-bounces+ath10k=archiver.kernel.org@lists.infradead.org From: Sebastian Gottschall [ Upstream commit e8a91863eba3966a447d2daa1526082d52b5db2a ] While running stress tests in roaming scenarios (switching ap's every 5 seconds, we discovered a issue which leads to tx hangings of exactly 5 seconds while or after scanning for new accesspoints. We found out that this hanging is triggered by ath10k_mac_wait_tx_complete since the empty_tx_wq was not wake when the num_tx_pending counter reaches zero. To fix this, we simply move the wake_up call to htt_tx_dec_pending, since this call was missed on several locations within the ath10k code. Signed-off-by: Sebastian Gottschall Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20210505085806.11474-1-s.gottschall@dd-wrt.com Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/ath10k/htt_tx.c | 3 +++ drivers/net/wireless/ath/ath10k/txrx.c | 2 -- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c index fd011bdabb963..3718d4dfc6d60 100644 --- a/drivers/net/wireless/ath/ath10k/htt_tx.c +++ b/drivers/net/wireless/ath/ath10k/htt_tx.c @@ -158,6 +158,9 @@ void ath10k_htt_tx_dec_pending(struct ath10k_htt *htt) htt->num_pending_tx--; if (htt->num_pending_tx == htt->max_num_pending_tx - 1) ath10k_mac_tx_unlock(htt->ar, ATH10K_TX_PAUSE_Q_FULL); + + if (htt->num_pending_tx == 0) + wake_up(&htt->empty_tx_wq); } int ath10k_htt_tx_inc_pending(struct ath10k_htt *htt) diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c index 6c47e4b6aa6cd..888a8f4aff5d8 100644 --- a/drivers/net/wireless/ath/ath10k/txrx.c +++ b/drivers/net/wireless/ath/ath10k/txrx.c @@ -91,8 +91,6 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt, ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id); ath10k_htt_tx_dec_pending(htt); - if (htt->num_pending_tx == 0) - wake_up(&htt->empty_tx_wq); spin_unlock_bh(&htt->tx_lock); dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE); -- 2.34.1 _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 474B5C433F5 for ; Tue, 18 Jan 2022 03:07:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349974AbiARDHi (ORCPT ); Mon, 17 Jan 2022 22:07:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353682AbiARDC1 (ORCPT ); Mon, 17 Jan 2022 22:02:27 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E096C028BD6; Mon, 17 Jan 2022 18:47:48 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E4F8561127; Tue, 18 Jan 2022 02:47:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31274C36AF4; Tue, 18 Jan 2022 02:47:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642474067; bh=jLeeFf393B8HjgrocufcT+n/GYkXVkQ4rnUo38UVcLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GAcWqjAGUNwg2PHfrap6SgbqUzShHzx6hbhk4KwMIVN6clMlN67ODTH5e0MZxg/f6 old2LJMZvySbtvNzsZAaRWqFoSQHZ7TMPzyW7LHKGY9lJTvF9Jy4+2xUzbG2R3uvfI D29yyAdW0zESYls0UQZrtcg9ZwDeumH2LnrSpbTijpMrfExXb7xJPVcIEd0AigDkvm TAzTXTw3Ik891lgkuLiyoM/SS2G0axqLWnQQ5cxtt6two9WZMU0BEOGzozEgVKqXYT bqR8ARNwe9M/N/FPGxPnFS4gQuUEUWP37y+PuLU6GpcNRicj5zaYjy0nvelE+7x7HQ eHSXtLdp64kPA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sebastian Gottschall , Kalle Valo , Sasha Levin , kvalo@kernel.org, davem@davemloft.net, kuba@kernel.org, ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 21/59] ath10k: Fix tx hanging Date: Mon, 17 Jan 2022 21:46:22 -0500 Message-Id: <20220118024701.1952911-21-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220118024701.1952911-1-sashal@kernel.org> References: <20220118024701.1952911-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Sebastian Gottschall [ Upstream commit e8a91863eba3966a447d2daa1526082d52b5db2a ] While running stress tests in roaming scenarios (switching ap's every 5 seconds, we discovered a issue which leads to tx hangings of exactly 5 seconds while or after scanning for new accesspoints. We found out that this hanging is triggered by ath10k_mac_wait_tx_complete since the empty_tx_wq was not wake when the num_tx_pending counter reaches zero. To fix this, we simply move the wake_up call to htt_tx_dec_pending, since this call was missed on several locations within the ath10k code. Signed-off-by: Sebastian Gottschall Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20210505085806.11474-1-s.gottschall@dd-wrt.com Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/ath10k/htt_tx.c | 3 +++ drivers/net/wireless/ath/ath10k/txrx.c | 2 -- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c index fd011bdabb963..3718d4dfc6d60 100644 --- a/drivers/net/wireless/ath/ath10k/htt_tx.c +++ b/drivers/net/wireless/ath/ath10k/htt_tx.c @@ -158,6 +158,9 @@ void ath10k_htt_tx_dec_pending(struct ath10k_htt *htt) htt->num_pending_tx--; if (htt->num_pending_tx == htt->max_num_pending_tx - 1) ath10k_mac_tx_unlock(htt->ar, ATH10K_TX_PAUSE_Q_FULL); + + if (htt->num_pending_tx == 0) + wake_up(&htt->empty_tx_wq); } int ath10k_htt_tx_inc_pending(struct ath10k_htt *htt) diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c index 6c47e4b6aa6cd..888a8f4aff5d8 100644 --- a/drivers/net/wireless/ath/ath10k/txrx.c +++ b/drivers/net/wireless/ath/ath10k/txrx.c @@ -91,8 +91,6 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt, ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id); ath10k_htt_tx_dec_pending(htt); - if (htt->num_pending_tx == 0) - wake_up(&htt->empty_tx_wq); spin_unlock_bh(&htt->tx_lock); dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE); -- 2.34.1