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iio: buffer-dmaengine: add dev-managed calls for buffer alloc

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Currently, when using a 'iio_dmaengine_buffer_alloc()', an matching call to
'iio_dmaengine_buffer_free()' must be made.

With this change, this can be avoided by using
'devm_iio_dmaengine_buffer_alloc()'. The buffer will get free'd via the
device's devres handling.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2020-03-24 15:46:32 +02:00 committed by Jonathan Cameron
parent 6eb3b8acfd
commit e0fcca9fbd
2 changed files with 42 additions and 0 deletions
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39
drivers/iio/buffer/industrialio-buffer-dmaengine.c
View file

@ -229,6 +229,45 @@ void iio_dmaengine_buffer_free(struct iio_buffer *buffer)
}
EXPORT_SYMBOL_GPL(iio_dmaengine_buffer_free);
static void __devm_iio_dmaengine_buffer_free(struct device *dev, void *res)
{
iio_dmaengine_buffer_free(*(struct iio_buffer **)res);
}
/**
* devm_iio_dmaengine_buffer_alloc() - Resource-managed iio_dmaengine_buffer_alloc()
* @dev: Parent device for the buffer
* @channel: DMA channel name, typically "rx".
*
* This allocates a new IIO buffer which internally uses the DMAengine framework
* to perform its transfers. The parent device will be used to request the DMA
* channel.
*
* The buffer will be automatically de-allocated once the device gets destroyed.
*/
struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
const char *channel)
{
struct iio_buffer **bufferp, *buffer;
bufferp = devres_alloc(__devm_iio_dmaengine_buffer_free,
sizeof(*bufferp), GFP_KERNEL);
if (!bufferp)
return ERR_PTR(-ENOMEM);
buffer = iio_dmaengine_buffer_alloc(dev, channel);
if (IS_ERR(buffer)) {
devres_free(bufferp);
return buffer;
}
*bufferp = buffer;
devres_add(dev, bufferp);
return buffer;
}
EXPORT_SYMBOL_GPL(devm_iio_dmaengine_buffer_alloc);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("DMA buffer for the IIO framework");
MODULE_LICENSE("GPL");

3
include/linux/iio/buffer-dmaengine.h
View file

@ -14,4 +14,7 @@ struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
const char *channel);
void iio_dmaengine_buffer_free(struct iio_buffer *buffer);
struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
const char *channel);
#endif