From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:49921 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752587Ab3FQUfC (ORCPT ); Mon, 17 Jun 2013 16:35:02 -0400 Message-ID: <51BF72DA.3050106@redhat.com> Date: Mon, 17 Jun 2013 16:34:34 -0400 From: Don Dutile MIME-Version: 1.0 To: Bjorn Helgaas CC: Jiang Liu , Yinghai Lu , Jiang Liu , "Rafael J . Wysocki" , Greg Kroah-Hartman , Gu Zheng , Toshi Kani , Myron Stowe , Yijing Wang , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Joerg Roedel , Ingo Molnar , Hannes Reinecke , "Li, Zhen-Hua" , iommu@lists.linux-foundation.org Subject: Re: [PATCH v3, part2 17/20] PCI, iommu: use hotplug-safe iterators to walk PCI buses References: <1369583597-3801-1-git-send-email-jiang.liu@huawei.com> <1369583597-3801-18-git-send-email-jiang.liu@huawei.com> <20130617202010.GC7877@google.com> In-Reply-To: <20130617202010.GC7877@google.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-pci-owner@vger.kernel.org List-ID: On 06/17/2013 04:20 PM, Bjorn Helgaas wrote: > On Sun, May 26, 2013 at 11:53:14PM +0800, Jiang Liu wrote: >> Enhance iommu drviers to use hotplug-safe iterators to walk >> PCI buses. >> >> Signed-off-by: Jiang Liu >> Cc: Joerg Roedel >> Cc: Ingo Molnar >> Cc: Donald Dutile >> Cc: Hannes Reinecke >> Cc: "Li, Zhen-Hua" >> Cc: iommu@lists.linux-foundation.org >> Cc: linux-kernel@vger.kernel.org >> --- >> drivers/iommu/amd_iommu.c | 4 +++- >> drivers/iommu/dmar.c | 6 ++++-- > > The AMD and Intel IOMMU drivers are very different, and I would > split this into a patch for each. > +1 >> 2 files changed, 7 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c >> index 21d02b0..eef7a7e 100644 >> --- a/drivers/iommu/amd_iommu.c >> +++ b/drivers/iommu/amd_iommu.c >> @@ -352,6 +352,7 @@ static int init_iommu_group(struct device *dev) >> struct iommu_dev_data *dev_data; >> struct iommu_group *group; >> struct pci_dev *dma_pdev; >> + struct pci_bus *b = NULL; >> int ret; >> >> group = iommu_group_get(dev); >> @@ -388,7 +389,7 @@ static int init_iommu_group(struct device *dev) >> * the alias. Be careful to also test the parent device if >> * we think the alias is the root of the group. >> */ >> - bus = pci_find_bus(0, alias>> 8); >> + b = bus = pci_get_bus(0, alias>> 8); >> if (!bus) >> goto use_group; >> >> @@ -408,6 +409,7 @@ static int init_iommu_group(struct device *dev) >> dma_pdev = get_isolation_root(pci_dev_get(to_pci_dev(dev))); >> use_pdev: >> ret = use_pdev_iommu_group(dma_pdev, dev); >> + pci_bus_put(b); >> pci_dev_put(dma_pdev); >> return ret; >> use_group: >> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c >> index a7967ce..7162787 100644 >> --- a/drivers/iommu/dmar.c >> +++ b/drivers/iommu/dmar.c >> @@ -67,12 +67,12 @@ static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd) >> static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope, >> struct pci_dev **dev, u16 segment) >> { >> - struct pci_bus *bus; >> + struct pci_bus *b, *bus; >> struct pci_dev *pdev = NULL; >> struct acpi_dmar_pci_path *path; >> int count; >> >> - bus = pci_find_bus(segment, scope->bus); >> + b = bus = pci_get_bus(segment, scope->bus); >> path = (struct acpi_dmar_pci_path *)(scope + 1); >> count = (scope->length - sizeof(struct acpi_dmar_device_scope)) >> / sizeof(struct acpi_dmar_pci_path); >> @@ -97,6 +97,8 @@ static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope, >> count --; >> bus = pdev->subordinate; >> } >> + pci_bus_put(b); >> + >> if (!pdev) { >> pr_warn("Device scope device [%04x:%02x:%02x.%02x] not found\n", >> segment, scope->bus, path->dev, path->fn); >> -- >> 1.8.1.2 >>