iio: buffer-dma: support getting the DMA channel

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commit f9c198c3cc upstream.

Implement the .get_dma_dev() callback for DMA buffers by returning the
device that owns the DMA channel. This allows the core DMABUF
infrastructure to properly map DMA buffers using the correct device,
avoiding the need for bounce buffers on systems where memory is mapped
above the 32-bit range.

The function returns the DMA queue's device, which is the actual device
responsible for DMA operations in buffer-dma implementations.

Cc: stable@vger.kernel.org
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Nuno Sá 2025-10-07 10:15:22 +01:00 • committed by Greg Kroah-Hartman

parent 0cc09278c3

commit 61f136211d

2 changed files with 7 additions and 0 deletions

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6

drivers/iio/buffer/industrialio-buffer-dma.c

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1

include/linux/iio/buffer-dma.h

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