staging: comedi: complain if dma buffer allocation not supported
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>
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@ -76,6 +76,12 @@ static void __comedi_buf_alloc(struct comedi_device *dev,
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struct comedi_buf_page *buf;
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unsigned i;
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if (!IS_ENABLED(CONFIG_HAS_DMA) && s->async_dma_dir != DMA_NONE) {
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dev_err(dev->class_dev,
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"dma buffer allocation not supported\n");
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return;
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}
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async->buf_page_list = vzalloc(sizeof(*buf) * n_pages);
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if (async->buf_page_list)
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pages = vmalloc(sizeof(struct page *) * n_pages);
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