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When allocating a buffer to support asynchronous comedi commands, if a DMA coherent buffer was requested but `CONFIG_HAS_DMA` is undefined, bail out of local helper function `__comedi_buf_alloc()` with an error message. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>