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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 <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2015-03-16 23:49:08 +01:00
parent ce793486e2
commit ca5b74d267
4 changed files with 15 additions and 5 deletions
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4
drivers/acpi/glue.c
View File

@ -168,7 +168,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
unsigned int node_id;
int retval = -EINVAL;
if (ACPI_COMPANION(dev)) {
if (has_acpi_companion(dev)) {
if (acpi_dev) {
dev_warn(dev, "ACPI companion already set\n");
return -EINVAL;
@ -220,7 +220,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
list_add(&physical_node->node, physnode_list);
acpi_dev->physical_node_count++;
if (!ACPI_COMPANION(dev))
if (!has_acpi_companion(dev))
ACPI_COMPANION_SET(dev, acpi_dev);
acpi_physnode_link_name(physical_node_name, node_id);

4
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -166,7 +166,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
/* fast mode by default because of legacy reasons */
clk_freq = 400000;
if (ACPI_COMPANION(&pdev->dev)) {
if (has_acpi_companion(&pdev->dev)) {
dw_i2c_acpi_configure(pdev);
} else if (pdev->dev.of_node) {
of_property_read_u32(pdev->dev.of_node,
@ -286,7 +286,7 @@ static int dw_i2c_remove(struct platform_device *pdev)
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
if (ACPI_COMPANION(&pdev->dev))
if (has_acpi_companion(&pdev->dev))
dw_i2c_acpi_unconfigure(pdev);
return 0;

2
drivers/iommu/intel-iommu.c
View File

@ -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();

10
include/linux/acpi.h
View File

@ -58,6 +58,11 @@ static inline acpi_handle acpi_device_handle(struct acpi_device *adev)
acpi_fwnode_handle(adev) : NULL
#define ACPI_HANDLE(dev) acpi_device_handle(ACPI_COMPANION(dev))
static inline bool has_acpi_companion(struct device *dev)
{
return is_acpi_node(dev->fwnode);
}
static inline void acpi_preset_companion(struct device *dev,
struct acpi_device *parent, u64 addr)
{
@ -472,6 +477,11 @@ static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
return NULL;
}
static inline bool has_acpi_companion(struct device *dev)
{
return false;
}
static inline const char *acpi_dev_name(struct acpi_device *adev)
{
return NULL;