On Tue, 23 Jul 2024 11:32:21 -0500
David Lechner <dlechner@xxxxxxxxxxxx> wrote:
> If dma_get_slave_caps() fails, we need to release the dma channel before
> returning an error to avoid leaking the channel.
>
> Fixes: 2d6ca60f3284 ("iio: Add a DMAengine framework based buffer")
> Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx>
Applied to the fixes-togreg branch of iio.git and marked for stable.
Thanks,
J
> ---
> drivers/iio/buffer/industrialio-buffer-dmaengine.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> index 12aa1412dfa0..426cc614587a 100644
> --- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> +++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> @@ -237,7 +237,7 @@ static struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
>
> ret = dma_get_slave_caps(chan, &caps);
> if (ret < 0)
> - goto err_free;
> + goto err_release;
>
> /* Needs to be aligned to the maximum of the minimums */
> if (caps.src_addr_widths)
> @@ -263,6 +263,8 @@ static struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
>
> return &dmaengine_buffer->queue.buffer;
>
> +err_release:
> + dma_release_channel(chan);
> err_free:
> kfree(dmaengine_buffer);
> return ERR_PTR(ret);
>
> ---
> base-commit: 472438c7e0e2261c6737a8321f46ef176eef1c8f
> change-id: 20240723-iio-fix-dmaengine-free-on-error-6e6e8b4dd058
