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| author | Jesper Juhl <jesper.juhl@gmail.com> | 2005-12-11 06:43:09 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-09 12:13:20 -0800 |
| commit | c2dea6553090a3fd06ffa9ba512a09fdac4d1b6e (patch) | |
| tree | 25a5cfe0db7c2a5d457cdea3a818725a14f6c3c5 | |
| parent | f5c99dfc11dce8f26c1ceedb6595fa0eac335ea3 (diff) | |
| download | kernel-crypto-c2dea6553090a3fd06ffa9ba512a09fdac4d1b6e.tar.gz kernel-crypto-c2dea6553090a3fd06ffa9ba512a09fdac4d1b6e.tar.xz kernel-crypto-c2dea6553090a3fd06ffa9ba512a09fdac4d1b6e.zip | |
[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>
| -rw-r--r-- | drivers/pci/hotplug/pciehprm_acpi.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/pci/hotplug/pciehprm_acpi.c b/drivers/pci/hotplug/pciehprm_acpi.c index ae244e21862..2bdb30f68bf 100644 --- a/drivers/pci/hotplug/pciehprm_acpi.c +++ b/drivers/pci/hotplug/pciehprm_acpi.c @@ -174,7 +174,9 @@ int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev) acpi_status status; acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev)); struct pci_dev *pdev = dev; + struct pci_bus *parent; u8 *path_name; + /* * Per PCI firmware specification, we should run the ACPI _OSC * method to get control of hotplug hardware before using it. @@ -190,17 +192,18 @@ int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev) */ if (!pdev || !pdev->bus->parent) break; + parent = pdev->bus->parent; dbg("Could not find %s in acpi namespace, trying parent\n", pci_name(pdev)); - if (!pdev->bus->parent->self) + if (!parent->self) /* Parent must be a host bridge */ handle = acpi_get_pci_rootbridge_handle( - pci_domain_nr(pdev->bus->parent), - pdev->bus->parent->number); + pci_domain_nr(parent), + parent->number); else handle = DEVICE_ACPI_HANDLE( - &(pdev->bus->parent->self->dev)); - pdev = pdev->bus->parent->self; + &(parent->self->dev)); + pdev = parent->self; } while (handle) { |