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SubjectRe: [PATCH v11 4/8] iio: buffer-dmaengine: add dev-managed calls for buffer alloc
On Sat, 21 Mar 2020 10:53:11 +0200
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> 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>
Applied.

Thanks,

Jonathan

> ---
> .../buffer/industrialio-buffer-dmaengine.c | 39 +++++++++++++++++++
> include/linux/iio/buffer-dmaengine.h | 3 ++
> 2 files changed, 42 insertions(+)
>
> diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> index 94da3b1ca3a2..6dedf12b69a4 100644
> --- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> +++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> @@ -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");
> diff --git a/include/linux/iio/buffer-dmaengine.h b/include/linux/iio/buffer-dmaengine.h
> index b3a57444a886..0e503db71289 100644
> --- a/include/linux/iio/buffer-dmaengine.h
> +++ b/include/linux/iio/buffer-dmaengine.h
> @@ -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

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