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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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include/linux/acpi_dma.h
+3 -2
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@@ -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