From patchwork Tue Oct 17 09:16:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Greenman, Gregory" X-Patchwork-Id: 13424843 X-Patchwork-Delegate: johannes@sipsolutions.net 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 23377CDB474 for ; Tue, 17 Oct 2023 09:17:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234847AbjJQJR1 (ORCPT ); Tue, 17 Oct 2023 05:17:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343503AbjJQJRY (ORCPT ); Tue, 17 Oct 2023 05:17:24 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8307FED for ; Tue, 17 Oct 2023 02:17:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697534240; x=1729070240; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2dGltWDP7HxVRgN4zqIONzmCZKGYcbYGTbFFf0FN5/A=; b=fTcaSiPiaOOqTy0JuGFg5bK/rnZPEpGcVneFvejcI2n5c0sTHXRrga0O SWpQupFGW09VM+TowTFOqCoTymzs85SdAy4brFm4Cqkpp6oFNGsSVMWjF 09z6ihFnb4j1fxWaJzGfX7AcNhjOgLHvi45nUl5pGF5JAawRssyffrU4L KFQVOJ5NvEC/M8XGxYoRV7IUsoKUmkiOG9jrzXxZfOf7qQfvmlZxDx8zh v0CHc8kZIe23GTtOBCaLWJOgzK9tghu3gUPfAR8utmxKgc3osbNGRW58+ LNdm5FkGWliUXrR57Bhz669RUMWFDzdvg1SbXgEGudKMIaB6eMsNqckx+ A==; X-IronPort-AV: E=McAfee;i="6600,9927,10865"; a="370808551" X-IronPort-AV: E=Sophos;i="6.03,231,1694761200"; d="scan'208";a="370808551" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2023 02:17:20 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10865"; a="759731925" X-IronPort-AV: E=Sophos;i="6.03,231,1694761200"; d="scan'208";a="759731925" Received: from obarinsh-mobl1.ger.corp.intel.com (HELO ggreenma-mobl2.intel.com) ([10.214.213.101]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2023 02:17:18 -0700 From: gregory.greenman@intel.com To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, Johannes Berg , Gregory Greenman Subject: [PATCH 08/14] wifi: iwlwifi: pcie: synchronize IRQs before NAPI Date: Tue, 17 Oct 2023 12:16:43 +0300 Message-Id: <20231017115047.a0f4104b479a.Id5c50a944f709092aa6256e32d8c63b2b8d8d3ac@changeid> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20231017091649.65090-1-gregory.greenman@intel.com> References: <20231017091649.65090-1-gregory.greenman@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg When we want to synchronize the NAPI, which was added in commit 5af2bb3168db ("wifi: iwlwifi: call napi_synchronize() before freeing rx/tx queues"), we also need to make sure we can't actually reschedule the NAPI. Yes, this happens while interrupts are disabled, but interrupts may still be running or pending. Also call iwl_pcie_synchronize_irqs() to ensure we won't reschedule the NAPI. Fixes: 4cf2f5904d97 ("iwlwifi: queue: avoid memory leak in reset flow") Signed-off-by: Johannes Berg Signed-off-by: Gregory Greenman --- drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c | 1 + drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c index 085c4b49be87..c9e5bda8f0b7 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c @@ -161,6 +161,7 @@ void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans) if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) { IWL_DEBUG_INFO(trans, "DEVICE_ENABLED bit was set and is now cleared\n"); + iwl_pcie_synchronize_irqs(trans); iwl_pcie_rx_napi_sync(trans); iwl_txq_gen2_tx_free(trans); iwl_pcie_rx_stop(trans); diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index 385e152f04fe..a468e5efeecd 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -1264,6 +1264,7 @@ static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans) if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) { IWL_DEBUG_INFO(trans, "DEVICE_ENABLED bit was set and is now cleared\n"); + iwl_pcie_synchronize_irqs(trans); iwl_pcie_rx_napi_sync(trans); iwl_pcie_tx_stop(trans); iwl_pcie_rx_stop(trans);