From patchwork Thu May 11 13:14:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 13237901 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 E66E4C77B7F for ; Thu, 11 May 2023 13:18:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238205AbjEKNSU (ORCPT ); Thu, 11 May 2023 09:18:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238130AbjEKNRw (ORCPT ); Thu, 11 May 2023 09:17:52 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8CE010A20; Thu, 11 May 2023 06:16:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1683810996; x=1715346996; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=TAC73s9QwdyGD3M/5SJI0+AWbjKADBP6Sv9hNzZQGXc=; b=AE6fCeq7PdQ1tgyOEDZs6HW9qtthi8TSinwt4pGMtaQiIm9o4LVsT8o9 fasc9cuZinK6CYaTI1icSiLKMIKWtwLZS2aYlyFfw9gXfQx9MadayymKw ot8K3m7Mj6Z/Jw6OeBdPRbob9JIEXzznfhLt8M1tRHAm1oIXk/xZZ2V0C gBlS24sxr4PJfwtvW1zdZgT0nhFMl0Url462gYyZi4VYq70ykoDfX1hD5 ZmIVOgtNNRXkeyij0rH8/DBHIcd7xRK/nWMF2wD/G4meIAfaFlDH03vS/ FoNUlsuoGDgBcwvIT5SP01uAiwshYpPCsN2SJzeMtNhPDMa85bhtOEPcl w==; X-IronPort-AV: E=McAfee;i="6600,9927,10706"; a="378619781" X-IronPort-AV: E=Sophos;i="5.99,266,1677571200"; d="scan'208";a="378619781" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2023 06:16:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10706"; a="650170161" X-IronPort-AV: E=Sophos;i="5.99,266,1677571200"; d="scan'208";a="650170161" Received: from jsanche3-mobl1.ger.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.252.39.112]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2023 06:15:57 -0700 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-pci@vger.kernel.org, Bjorn Helgaas , Rob Herring , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Lukas Wunner , Kalle Valo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?utf-8?q?Ilpo_J=C3=A4rvinen?= Subject: [PATCH 16/17] wifi: ath12k: Use pcie_lnkctl_clear_and_set() for changing LNKCTL Date: Thu, 11 May 2023 16:14:40 +0300 Message-Id: <20230511131441.45704-17-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230511131441.45704-1-ilpo.jarvinen@linux.intel.com> References: <20230511131441.45704-1-ilpo.jarvinen@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Don't assume that only the driver would be accessing LNKCTL. ASPM policy changes can trigger write to LNKCTL outside of driver's control. Use pcie_lnkctl_clear_and_set() which does proper locking to avoid losing concurrent updates to the register value. Suggested-by: Lukas Wunner Signed-off-by: Ilpo Järvinen --- drivers/net/wireless/ath/ath12k/pci.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c index 9f174daf324c..fa88a0b88520 100644 --- a/drivers/net/wireless/ath/ath12k/pci.c +++ b/drivers/net/wireless/ath/ath12k/pci.c @@ -794,8 +794,8 @@ static void ath12k_pci_aspm_disable(struct ath12k_pci *ab_pci) u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1)); /* disable L0s and L1 */ - pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL, - ab_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC); + pcie_lnkctl_clear_and_set(ab_pci->pdev, + ab_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC, 0); set_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags); } @@ -803,8 +803,8 @@ static void ath12k_pci_aspm_disable(struct ath12k_pci *ab_pci) static void ath12k_pci_aspm_restore(struct ath12k_pci *ab_pci) { if (test_and_clear_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags)) - pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL, - ab_pci->link_ctl); + pcie_lnkctl_clear_and_set(ab_pci->pdev, 0, + ab_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC); } static void ath12k_pci_kill_tasklets(struct ath12k_base *ab)