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acpi-dma: convert to return error code when asked for channel

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Currently acpi_dma_request_slave_chan_by_index() and
acpi_dma_request_slave_chan_by_name() return only requested channel or NULL.
This patch converts them to return appropriate error code instead of NULL in
case of unsuccessfull request.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2014-02-06 13:25:40 +02:00 committed by Vinod Koul
parent 8f01258385
commit 0f6a928d03
3 changed files with 13 additions and 16 deletions
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15
drivers/dma/acpi-dma.c
View File

@ -13,6 +13,7 @@
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/mutex.h>
@ -343,7 +344,7 @@ static int acpi_dma_parse_fixed_dma(struct acpi_resource *res, void *data)
* @index: index of FixedDMA descriptor for @dev
*
* Return:
* Pointer to appropriate dma channel on success or NULL on error.
* Pointer to appropriate dma channel on success or an error pointer.
*/
struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
size_t index)
@ -358,10 +359,10 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
/* Check if the device was enumerated by ACPI */
if (!dev || !ACPI_HANDLE(dev))
return NULL;
return ERR_PTR(-ENODEV);
if (acpi_bus_get_device(ACPI_HANDLE(dev), &adev))
return NULL;
return ERR_PTR(-ENODEV);
memset(&pdata, 0, sizeof(pdata));
pdata.index = index;
@ -376,7 +377,7 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
acpi_dev_free_resource_list(&resource_list);
if (dma_spec->slave_id < 0 || dma_spec->chan_id < 0)
return NULL;
return ERR_PTR(-ENODEV);
mutex_lock(&acpi_dma_lock);
@ -399,7 +400,7 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
}
mutex_unlock(&acpi_dma_lock);
return chan;
return chan ? chan : ERR_PTR(-EPROBE_DEFER);
}
EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_index);
@ -413,7 +414,7 @@ EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_index);
* the first FixedDMA descriptor is TX and second is RX.
*
* Return:
* Pointer to appropriate dma channel on success or NULL on error.
* 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)
@ -425,7 +426,7 @@ struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
else if (!strcmp(name, "rx"))
index = 1;
else
return NULL;
return ERR_PTR(-ENODEV);
return acpi_dma_request_slave_chan_by_index(dev, index);
}

9
drivers/dma/dmaengine.c
View File

@ -627,18 +627,13 @@ EXPORT_SYMBOL_GPL(__dma_request_channel);
struct dma_chan *dma_request_slave_channel_reason(struct device *dev,
const char *name)
{
struct dma_chan *chan;
/* If device-tree is present get slave info from here */
if (dev->of_node)
return of_dma_request_slave_channel(dev->of_node, name);
/* If device was enumerated by ACPI get slave info from here */
if (ACPI_HANDLE(dev)) {
chan = acpi_dma_request_slave_chan_by_name(dev, name);
if (chan)
return chan;
}
if (ACPI_HANDLE(dev))
return acpi_dma_request_slave_chan_by_name(dev, name);
return ERR_PTR(-ENODEV);
}

5
include/linux/acpi_dma.h
View File

@ -16,6 +16,7 @@
#include <linux/list.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/dmaengine.h>
/**
@ -103,12 +104,12 @@ static inline void devm_acpi_dma_controller_free(struct device *dev)
static inline struct dma_chan *acpi_dma_request_slave_chan_by_index(
struct device *dev, size_t index)
{
return NULL;
return ERR_PTR(-ENODEV);
}
static inline struct dma_chan *acpi_dma_request_slave_chan_by_name(
struct device *dev, const char *name)
{
return NULL;
return ERR_PTR(-ENODEV);
}
#define acpi_dma_simple_xlate NULL