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ACPI: Introduce has_acpi_companion()

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Now that the ACPI companions of devices are represented by pointers
to struct fwnode_handle, it is not quite efficient to check whether
or not an ACPI companion of a device is present by evaluating the
ACPI_COMPANION() macro.

For this reason, introduce a special static inline routine for that,
has_acpi_companion(), and update the code to use it where applicable.

Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2015-03-16 23:49:08 +01:00
commit ca5b74d267
4 changed files with 15 additions and 5 deletions
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2
drivers/iommu/intel-iommu.c
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@ -684,7 +684,7 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
if (dev_is_pci(dev)) {
pdev = to_pci_dev(dev);
segment = pci_domain_nr(pdev->bus);
} else if (ACPI_COMPANION(dev))
} else if (has_acpi_companion(dev))
dev = &ACPI_COMPANION(dev)->dev;
rcu_read_lock();