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To function correctly in the presence of an IOMMU, the DMA buffers must be managed using the DMA channel's device instead of the platform device's device. Make sure to free the DMA memory before releasing the channel, not after. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>