23 	struct comedi_buf_map *bm =  in comedi_buf_map_kref_release()  local
28 	if (bm->page_list) {  in comedi_buf_map_kref_release()
29 		if (bm->dma_dir != DMA_NONE) {  in comedi_buf_map_kref_release()
34 			buf = &bm->page_list[0];  in comedi_buf_map_kref_release()
35 			dma_free_coherent(bm->dma_hw_dev,  in comedi_buf_map_kref_release()
36 					  PAGE_SIZE * bm->n_pages,  in comedi_buf_map_kref_release()
39 			for (i = 0; i < bm->n_pages; i++) {  in comedi_buf_map_kref_release()
40 				buf = &bm->page_list[i];  in comedi_buf_map_kref_release()
45 		vfree(bm->page_list);  in comedi_buf_map_kref_release()
47 	if (bm->dma_dir != DMA_NONE)  in comedi_buf_map_kref_release()
48 		put_device(bm->dma_hw_dev);  in comedi_buf_map_kref_release()
49 	kfree(bm);  in comedi_buf_map_kref_release()
56 	struct comedi_buf_map *bm;  in __comedi_buf_free()  local
67 	bm = async->buf_map;  in __comedi_buf_free()
70 	comedi_buf_map_put(bm);  in __comedi_buf_free()
77 	struct comedi_buf_map *bm;  in comedi_buf_map_alloc()  local
81 	bm = kzalloc(sizeof(*bm), GFP_KERNEL);  in comedi_buf_map_alloc()
82 	if (!bm)  in comedi_buf_map_alloc()
85 	kref_init(&bm->refcount);  in comedi_buf_map_alloc()
86 	bm->dma_dir = dma_dir;  in comedi_buf_map_alloc()
87 	if (bm->dma_dir != DMA_NONE) {  in comedi_buf_map_alloc()
89 		bm->dma_hw_dev = get_device(dev->hw_dev);  in comedi_buf_map_alloc()
92 	bm->page_list = vzalloc(sizeof(*buf) * n_pages);  in comedi_buf_map_alloc()
93 	if (!bm->page_list)  in comedi_buf_map_alloc()
96 	if (bm->dma_dir != DMA_NONE) {  in comedi_buf_map_alloc()
104 		virt_addr = dma_alloc_coherent(bm->dma_hw_dev,  in comedi_buf_map_alloc()
111 			buf = &bm->page_list[i];  in comedi_buf_map_alloc()
116 		bm->n_pages = i;  in comedi_buf_map_alloc()
119 			buf = &bm->page_list[i];  in comedi_buf_map_alloc()
127 		bm->n_pages = i;  in comedi_buf_map_alloc()
132 	return bm;  in comedi_buf_map_alloc()
135 	comedi_buf_map_put(bm);  in comedi_buf_map_alloc()
145 	struct comedi_buf_map *bm;  in __comedi_buf_alloc()  local
156 	bm = comedi_buf_map_alloc(dev, s->async_dma_dir, n_pages);  in __comedi_buf_alloc()
157 	if (!bm)  in __comedi_buf_alloc()
161 	async->buf_map = bm;  in __comedi_buf_alloc()
164 	if (bm->dma_dir != DMA_NONE) {  in __comedi_buf_alloc()
169 		buf = &bm->page_list[0];  in __comedi_buf_alloc()
177 			buf = &bm->page_list[i];  in __comedi_buf_alloc()
189 void comedi_buf_map_get(struct comedi_buf_map *bm)  in comedi_buf_map_get()  argument
191 	if (bm)  in comedi_buf_map_get()
192 		kref_get(&bm->refcount);  in comedi_buf_map_get()
195 int comedi_buf_map_put(struct comedi_buf_map *bm)  in comedi_buf_map_put()  argument
197 	if (bm)  in comedi_buf_map_put()
198 		return kref_put(&bm->refcount, comedi_buf_map_kref_release);  in comedi_buf_map_put()
203 int comedi_buf_map_access(struct comedi_buf_map *bm, unsigned long offset,  in comedi_buf_map_access()  argument
210 	while (done < len && pg < bm->n_pages) {  in comedi_buf_map_access()
212 		void *b = bm->page_list[pg].virt_addr + pgoff;  in comedi_buf_map_access()
231 	struct comedi_buf_map *bm = NULL;  in comedi_buf_map_from_subdev_get()  local
238 	bm = async->buf_map;  in comedi_buf_map_from_subdev_get()
240 	if (bm && bm->n_pages)  in comedi_buf_map_from_subdev_get()
241 		comedi_buf_map_get(bm);  in comedi_buf_map_from_subdev_get()
243 		bm = NULL;  in comedi_buf_map_from_subdev_get()
246 	return bm;  in comedi_buf_map_from_subdev_get()
251 	struct comedi_buf_map *bm = s->async->buf_map;  in comedi_buf_is_mmapped()  local
253 	return bm && (kref_read(&bm->refcount) > 1);  in comedi_buf_is_mmapped()