From: Jonathan Cameron <jic23@kernel.org>
To: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<devicetree@vger.kernel.org>, <robh+dt@kernel.org>,
<Laszlo.Nagy@analog.com>, <Andrei.Grozav@analog.com>,
<Michael.Hennerich@analog.com>, <Istvan.Csomortani@analog.com>,
<Adrian.Costina@analog.com>, <Dragos.Bogdan@analog.com>
Subject: Re: [PATCH v11 4/8] iio: buffer-dmaengine: add dev-managed calls for buffer alloc
Date: Sat, 21 Mar 2020 17:22:40 +0000 [thread overview]
Message-ID: <20200321172240.098de03f@archlinux> (raw)
In-Reply-To: <20200321085315.11030-5-alexandru.ardelean@analog.com>
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
next prev parent reply other threads:[~2020-03-21 17:22 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-21 8:53 [PATCH v11 0/8] iio: adi-axi-adc,ad9647: Add support for AD9467 ADC Alexandru Ardelean
2020-03-21 8:53 ` [PATCH v11 1/8] include: fpga: adi-axi-common.h: fixup whitespace tab -> space Alexandru Ardelean
2020-03-21 8:53 ` [PATCH v11 2/8] include: fpga: adi-axi-common.h: add version helper macros Alexandru Ardelean
2020-03-21 17:21 ` Jonathan Cameron
2020-03-21 8:53 ` [PATCH v11 3/8] iio: buffer-dmaengine: use %zu specifier for sprintf(align) Alexandru Ardelean
2020-03-21 17:22 ` Jonathan Cameron
2020-03-21 8:53 ` [PATCH v11 4/8] iio: buffer-dmaengine: add dev-managed calls for buffer alloc Alexandru Ardelean
2020-03-21 17:22 ` Jonathan Cameron [this message]
2020-03-21 8:53 ` [PATCH v11 5/8] iio: adc: adi-axi-adc: add support for AXI ADC IP core Alexandru Ardelean
2020-03-21 17:15 ` Jonathan Cameron
2020-03-21 21:38 ` Andy Shevchenko
2020-03-22 9:35 ` Ardelean, Alexandru
2020-03-22 10:45 ` Andy Shevchenko
2020-03-22 16:11 ` Ardelean, Alexandru
2020-03-22 16:16 ` Kees Cook
2020-03-22 16:31 ` Ardelean, Alexandru
2020-03-22 16:44 ` Ardelean, Alexandru
2020-03-22 16:53 ` Jonathan Cameron
2020-03-22 17:40 ` Ardelean, Alexandru
2020-03-22 18:26 ` Jonathan Cameron
2020-03-24 7:10 ` Ardelean, Alexandru
2020-03-22 15:20 ` Jonathan Cameron
2020-03-21 8:53 ` [PATCH v11 6/8] dt-bindings: iio: adc: add bindings doc for AXI ADC driver Alexandru Ardelean
2020-03-21 17:23 ` Jonathan Cameron
2020-03-21 8:53 ` [PATCH v11 7/8] iio: adc: ad9467: add support AD9467 ADC Alexandru Ardelean
2020-03-21 17:23 ` Jonathan Cameron
2020-03-21 8:53 ` [PATCH v11 8/8] dt-bindings: iio: adc: add bindings doc for " Alexandru Ardelean
2020-03-21 17:24 ` Jonathan Cameron
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