From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF31C68 for ; Wed, 1 Dec 2021 18:58:41 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10185"; a="216547098" X-IronPort-AV: E=Sophos;i="5.87,279,1631602800"; d="scan'208";a="216547098" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Dec 2021 10:58:41 -0800 X-IronPort-AV: E=Sophos;i="5.87,279,1631602800"; d="scan'208";a="500371301" Received: from ammonk-mobl.amr.corp.intel.com (HELO vcostago-mobl3.intel.com) ([10.212.205.220]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Dec 2021 10:58:40 -0800 From: Vinicius Costa Gomes To: roots@gmx.de Cc: Vinicius Costa Gomes , kuba@kernel.org, greg@kroah.com, netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org, stable@vger.kernel.org, regressions@lists.linux.dev Subject: [PATCH] igc: Avoid possible deadlock during suspend/resume Date: Wed, 1 Dec 2021 10:57:31 -0800 Message-Id: <20211201185731.236130-1-vinicius.gomes@intel.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <87r1awtdx3.fsf@intel.com> References: <87r1awtdx3.fsf@intel.com> Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Inspired by: https://bugzilla.kernel.org/show_bug.cgi?id=215129 Signed-off-by: Vinicius Costa Gomes --- Just to see if it's indeed the same problem as the bug report above. drivers/net/ethernet/intel/igc/igc_main.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 0e19b4d02e62..c58bf557a2a1 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -6619,7 +6619,7 @@ static void igc_deliver_wake_packet(struct net_device *netdev) netif_rx(skb); } -static int __maybe_unused igc_resume(struct device *dev) +static int __maybe_unused __igc_resume(struct device *dev, bool rpm) { struct pci_dev *pdev = to_pci_dev(dev); struct net_device *netdev = pci_get_drvdata(pdev); @@ -6661,20 +6661,27 @@ static int __maybe_unused igc_resume(struct device *dev) wr32(IGC_WUS, ~0); - rtnl_lock(); + if (!rpm) + rtnl_lock(); if (!err && netif_running(netdev)) err = __igc_open(netdev, true); if (!err) netif_device_attach(netdev); - rtnl_unlock(); + if (!rpm) + rtnl_unlock(); return err; } static int __maybe_unused igc_runtime_resume(struct device *dev) { - return igc_resume(dev); + return __igc_resume(dev, true); +} + +static int __maybe_unused igc_resume(struct device *dev) +{ + return __igc_resume(dev, false); } static int __maybe_unused igc_suspend(struct device *dev) @@ -6738,7 +6745,7 @@ static pci_ers_result_t igc_io_error_detected(struct pci_dev *pdev, * @pdev: Pointer to PCI device * * Restart the card from scratch, as if from a cold-boot. Implementation - * resembles the first-half of the igc_resume routine. + * resembles the first-half of the __igc_resume routine. **/ static pci_ers_result_t igc_io_slot_reset(struct pci_dev *pdev) { @@ -6777,7 +6784,7 @@ static pci_ers_result_t igc_io_slot_reset(struct pci_dev *pdev) * * This callback is called when the error recovery driver tells us that * its OK to resume normal operation. Implementation resembles the - * second-half of the igc_resume routine. + * second-half of the __igc_resume routine. */ static void igc_io_resume(struct pci_dev *pdev) { -- 2.33.1