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[PATCH] PCI: Reduce nr of ptr derefs in drivers/pci/hotplug/pciehprm_acpi.c
Here's a small patch to reduce the nr. of pointer dereferences in drivers/pci/hotplug/pciehprm_acpi.c Benefits: - micro speed optimization due to fewer pointer derefs - generated code is slightly smaller - better readability Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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commit
c2dea65530
1 changed files with 8 additions and 5 deletions
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@ -174,7 +174,9 @@ int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev)
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acpi_status status;
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acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
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struct pci_dev *pdev = dev;
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struct pci_bus *parent;
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u8 *path_name;
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/*
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* Per PCI firmware specification, we should run the ACPI _OSC
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* method to get control of hotplug hardware before using it.
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@ -190,17 +192,18 @@ int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev)
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*/
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if (!pdev || !pdev->bus->parent)
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break;
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parent = pdev->bus->parent;
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dbg("Could not find %s in acpi namespace, trying parent\n",
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pci_name(pdev));
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if (!pdev->bus->parent->self)
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if (!parent->self)
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/* Parent must be a host bridge */
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handle = acpi_get_pci_rootbridge_handle(
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pci_domain_nr(pdev->bus->parent),
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pdev->bus->parent->number);
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pci_domain_nr(parent),
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parent->number);
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else
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handle = DEVICE_ACPI_HANDLE(
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&(pdev->bus->parent->self->dev));
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pdev = pdev->bus->parent->self;
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&(parent->self->dev));
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pdev = parent->self;
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}
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while (handle) {
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