acpi-dma: Use ACPI_COMPANION() instead of acpi_bus_get_device()

Get pointer to the struct acpi_device by using ACPI_COMPANION() macro. This is more efficient than using ACPI_HANDLE() and acpi_bus_get_device().

Signed-off-by Jarkko Nikula <[email protected]>

---
 drivers/dma/acpi-dma.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

drivers/dma/acpi-dma.c +5 -6

index 5a635646e05c..04257432c482 100644
@@ -160,10 +160,8 @@ int acpi_dma_controller_register(struct device *dev,
 		return -EINVAL;
 
 	/* Check if the device was enumerated by ACPI */
-	if (!ACPI_HANDLE(dev))
-		return -EINVAL;
-
-	if (acpi_bus_get_device(ACPI_HANDLE(dev), &adev))
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
 		return -EINVAL;
 
 	adma = kzalloc(sizeof(*adma), GFP_KERNEL);

@@ -358,10 +356,11 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
 	int found;
 
 	/* Check if the device was enumerated by ACPI */
-	if (!dev || !ACPI_HANDLE(dev))
+	if (!dev)
 		return ERR_PTR(-ENODEV);
 
-	if (acpi_bus_get_device(ACPI_HANDLE(dev), &adev))
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
 		return ERR_PTR(-ENODEV);
 
 	memset(&pdata, 0, sizeof(pdata));

Get pointer to the struct acpi_device by using ACPI_COMPANION() macro. This is more efficient than using ACPI_HANDLE() and acpi_bus_get_device().