dmaengine: acpi: 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 <jarkko.nikula@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/drivers/dma/acpi-dma.c b/drivers/dma/acpi-dma.c
index 5a635646e05c..04257432c482 100644
--- a/drivers/dma/acpi-dma.c
+++ b/drivers/dma/acpi-dma.c
@@ -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));