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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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9
drivers/dma/dmaengine.c
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@@ -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);
}