These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / dma / acpi-dma.c

diff --git a/kernel/drivers/dma/acpi-dma.c b/kernel/drivers/dma/acpi-dma.c
index 5a63564..16d0daa 100644 (file)
--- a/kernel/drivers/dma/acpi-dma.c
+++ b/kernel/drivers/dma/acpi-dma.c
@@ -21,6 +21,7 @@
 #include <linux/ioport.h>
 #include <linux/acpi.h>
 #include <linux/acpi_dma.h>
+#include <linux/property.h>
 
 static LIST_HEAD(acpi_dma_list);
 static DEFINE_MUTEX(acpi_dma_lock);
@@ -160,10 +161,8 @@ 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 +357,11 @@ 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));
@@ -413,21 +413,29 @@ EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_index);
  * translate the names "tx" and "rx" here based on the most common case where
  * the first FixedDMA descriptor is TX and second is RX.
  *
+ * If the device has "dma-names" property the FixedDMA descriptor indices
+ * are retrieved based on those. Otherwise the function falls back using
+ * hardcoded indices.
+ *
  * Return:
  * Pointer to appropriate dma channel on success or an error pointer.
  */
 struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
                const char *name)
 {
-       size_t index;
-
-       if (!strcmp(name, "tx"))
-               index = 0;
-       else if (!strcmp(name, "rx"))
-               index = 1;
-       else
-               return ERR_PTR(-ENODEV);
+       int index;
+
+       index = device_property_match_string(dev, "dma-names", name);
+       if (index < 0) {
+               if (!strcmp(name, "tx"))
+                       index = 0;
+               else if (!strcmp(name, "rx"))
+                       index = 1;
+               else
+                       return ERR_PTR(-ENODEV);
+       }
 
+       dev_dbg(dev, "found DMA channel \"%s\" at index %d\n", name, index);
        return acpi_dma_request_slave_chan_by_index(dev, index);
 }
 EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_name);