From patchwork Thu Jun 28 19:30:59 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sinan Kaya X-Patchwork-Id: 10494959 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 62C4560325 for ; Thu, 28 Jun 2018 19:33:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6566929B3E for ; Thu, 28 Jun 2018 19:33:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5945E29B40; Thu, 28 Jun 2018 19:33:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DF27D29B1B for ; Thu, 28 Jun 2018 19:33:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934171AbeF1TbV (ORCPT ); Thu, 28 Jun 2018 15:31:21 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:53010 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933192AbeF1TbU (ORCPT ); Thu, 28 Jun 2018 15:31:20 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id A5EC360B23; Thu, 28 Jun 2018 19:31:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1530214279; bh=YeZNEXnABmo7R3nVUfX4jkEWDejJ0hHEkcgBqc0xgc4=; h=From:To:Cc:Subject:Date:From; b=j4JM/FfaUM78WdqJeYO4CUFUsmU0rw3NujDneneDtRtTlTzFJfN+Q+U2qAXHOU40/ SF+E/zhh9NvMfMgpshmxT4gB8f10KZL5ZNs2XPqaPrCNltHIDUVMRpk6C2X055RRyT 6tFM17fWwaMjX+dtOjcSJ/xbuyrYlx2atGdzfASs= Received: from drakthul.qualcomm.com (global_nat1_iad_fw.qualcomm.com [129.46.232.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: okaya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 518CA60274; Thu, 28 Jun 2018 19:31:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1530214278; bh=YeZNEXnABmo7R3nVUfX4jkEWDejJ0hHEkcgBqc0xgc4=; h=From:To:Cc:Subject:Date:From; b=PhoiSbfoWwcam506qx8W7NHLreiuk2Qob9CRN0tmEhSzIrHUTEZUKfJ16vyBZ3MPa WiCywuDWDY7+B1OKp4unHTIu/YfbUI5szZr5Yl9kOiiS2XlDHi6kqHfuuHjI/tirQ5 wqkt3YyDYsVd1muGJ09HHWItb6I8KZpd2/sdAj10= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 518CA60274 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=okaya@codeaurora.org From: Sinan Kaya To: linux-pci@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya , Bjorn Helgaas , Mika Westerberg , Keith Busch , Kees Cook , Lukas Wunner , Oza Pawandeep , Frederick Lawler , linux-kernel@vger.kernel.org (open list) Subject: [PATCH V4 1/7] PCI: handle error return from pci_reset_bridge_secondary_bus() Date: Thu, 28 Jun 2018 15:30:59 -0400 Message-Id: <1530214274-21139-1-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP commit 01fd61c0b9bd ("PCI: Add a return type for pci_reset_bridge_secondary_bus()") added a return value to the function to return if a device is accessible following a reset. Callers are not checking the value. Pass error code up high in the stack if device is not accessible. Signed-off-by: Sinan Kaya --- drivers/pci/hotplug/pciehp_hpc.c | 5 +++-- drivers/pci/pci.c | 12 ++++++------ drivers/pci/pcie/aer.c | 5 +++-- drivers/pci/pcie/err.c | 6 ++++-- 4 files changed, 16 insertions(+), 12 deletions(-) diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 718b607..bbaa211 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -728,6 +728,7 @@ int pciehp_reset_slot(struct slot *slot, int probe) struct controller *ctrl = slot->ctrl; struct pci_dev *pdev = ctrl_dev(ctrl); u16 stat_mask = 0, ctrl_mask = 0; + int rc; if (probe) return 0; @@ -745,7 +746,7 @@ int pciehp_reset_slot(struct slot *slot, int probe) if (pciehp_poll_mode) del_timer_sync(&ctrl->poll_timer); - pci_reset_bridge_secondary_bus(ctrl->pcie->port); + rc = pci_reset_bridge_secondary_bus(ctrl->pcie->port); pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, stat_mask); pcie_write_cmd_nowait(ctrl, ctrl_mask, ctrl_mask); @@ -753,7 +754,7 @@ int pciehp_reset_slot(struct slot *slot, int probe) pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, ctrl_mask); if (pciehp_poll_mode) int_poll_timeout(&ctrl->poll_timer); - return 0; + return rc; } int pcie_init_notification(struct controller *ctrl) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 97acba7..98d1490 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4253,9 +4253,7 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe) if (probe) return 0; - pci_reset_bridge_secondary_bus(dev->bus->self); - - return 0; + return pci_reset_bridge_secondary_bus(dev->bus->self); } static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe) @@ -4850,6 +4848,8 @@ EXPORT_SYMBOL_GPL(pci_try_reset_slot); static int pci_bus_reset(struct pci_bus *bus, int probe) { + int ret; + if (!bus->self || !pci_bus_resetable(bus)) return -ENOTTY; @@ -4860,11 +4860,11 @@ static int pci_bus_reset(struct pci_bus *bus, int probe) might_sleep(); - pci_reset_bridge_secondary_bus(bus->self); + ret = pci_reset_bridge_secondary_bus(bus->self); pci_bus_unlock(bus); - return 0; + return ret; } /** @@ -4924,7 +4924,7 @@ int pci_try_reset_bus(struct pci_bus *bus) if (pci_bus_trylock(bus)) { might_sleep(); - pci_reset_bridge_secondary_bus(bus->self); + rc = pci_reset_bridge_secondary_bus(bus->self); pci_bus_unlock(bus); } else rc = -EAGAIN; diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index a2e8838..f1d0f3e 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -1305,6 +1305,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) { u32 reg32; int pos; + int rc; pos = dev->aer_cap; @@ -1313,7 +1314,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); - pci_reset_bridge_secondary_bus(dev); + rc = pci_reset_bridge_secondary_bus(dev); pci_printk(KERN_DEBUG, dev, "Root Port link has been reset\n"); /* Clear Root Error Status */ @@ -1325,7 +1326,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); - return PCI_ERS_RESULT_RECOVERED; + return !rc ? PCI_ERS_RESULT_RECOVERED : PCI_ERS_RESULT_DISCONNECT; } /** diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c index f7ce0cb..3a62a2e 100644 --- a/drivers/pci/pcie/err.c +++ b/drivers/pci/pcie/err.c @@ -175,9 +175,11 @@ static int report_resume(struct pci_dev *dev, void *data) */ static pci_ers_result_t default_reset_link(struct pci_dev *dev) { - pci_reset_bridge_secondary_bus(dev); + int rc; + + rc = pci_reset_bridge_secondary_bus(dev); pci_printk(KERN_DEBUG, dev, "downstream link has been reset\n"); - return PCI_ERS_RESULT_RECOVERED; + return !rc ? PCI_ERS_RESULT_RECOVERED : PCI_ERS_RESULT_DISCONNECT; } static pci_ers_result_t reset_link(struct pci_dev *dev, u32 service)