Messages in this thread | | | Date | Wed, 15 May 2013 23:36:44 +0800 | From | Liu Jiang <> | Subject | Re: [RFC PATCH v2, part 2 16/18] PCI, iommu: use hotplug-safe iterators to walk PCI buses |
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On 05/15/2013 06:13 AM, Don Dutile wrote: > On 05/14/2013 12:52 PM, Jiang Liu wrote: >> Enhance iommu drviers to use hotplug-safe iterators to walk >> PCI buses. >> >> Signed-off-by: Jiang Liu<jiang.liu@huawei.com> >> Cc: Joerg Roedel<joro@8bytes.org> >> Cc: Ingo Molnar<mingo@kernel.org> >> Cc: Donald Dutile<ddutile@redhat.com> >> Cc: Hannes Reinecke<hare@suse.de> >> Cc: "Li, Zhen-Hua"<zhen-hual@hp.com> >> Cc: iommu@lists.linux-foundation.org >> Cc: linux-kernel@vger.kernel.org >> --- >> drivers/iommu/amd_iommu.c | 4 +++- >> drivers/iommu/dmar.c | 6 ++++-- >> 2 files changed, 7 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c >> index e046d7a..d6fdf94 100644 >> --- a/drivers/iommu/amd_iommu.c >> +++ b/drivers/iommu/amd_iommu.c >> @@ -357,6 +357,7 @@ 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); >> @@ -393,7 +394,7 @@ 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_find_bus(0, alias>> 8); >> if (!bus) >> goto use_group; >> >> @@ -413,6 +414,7 @@ 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_find_bus() does a pci_bus_put() after the pci_get_bus(); > is this needed, or did you mean to make the above patch pci_get_bus() ? Hi Don, Thanks for review! My fault, I should use pci_get_bus() instead, will fix it in next version. Regards! Gerry
> >> pci_dev_put(dma_pdev); >> return ret; >> use_group: >> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c >> index e5cdaf8..5bb3cdc 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_find_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); > ditto. > >> + >> if (!pdev) { >> pr_warn("Device scope device [%04x:%02x:%02x.%02x] not >> found\n", >> segment, scope->bus, path->dev, path->fn); >
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