24 	struct comedi_buf_map *bm =  in comedi_buf_map_kref_release()  local
29 	if (bm->page_list) {  in comedi_buf_map_kref_release()
30 		if (bm->dma_dir != DMA_NONE) {  in comedi_buf_map_kref_release()
35 			buf = &bm->page_list[0];  in comedi_buf_map_kref_release()
36 			dma_free_coherent(bm->dma_hw_dev,  in comedi_buf_map_kref_release()
37 					  PAGE_SIZE * bm->n_pages,  in comedi_buf_map_kref_release()
40 			for (i = 0; i < bm->n_pages; i++) {  in comedi_buf_map_kref_release()
41 				buf = &bm->page_list[i];  in comedi_buf_map_kref_release()
46 		vfree(bm->page_list);  in comedi_buf_map_kref_release()
48 	if (bm->dma_dir != DMA_NONE)  in comedi_buf_map_kref_release()
49 		put_device(bm->dma_hw_dev);  in comedi_buf_map_kref_release()
50 	kfree(bm);  in comedi_buf_map_kref_release()
57 	struct comedi_buf_map *bm;  in __comedi_buf_free()  local
68 	bm = async->buf_map;  in __comedi_buf_free()
71 	comedi_buf_map_put(bm);  in __comedi_buf_free()
78 	struct comedi_buf_map *bm;  in comedi_buf_map_alloc()  local
82 	bm = kzalloc(sizeof(*bm), GFP_KERNEL);  in comedi_buf_map_alloc()
83 	if (!bm)  in comedi_buf_map_alloc()
86 	kref_init(&bm->refcount);  in comedi_buf_map_alloc()
87 	bm->dma_dir = dma_dir;  in comedi_buf_map_alloc()
88 	if (bm->dma_dir != DMA_NONE) {  in comedi_buf_map_alloc()
90 		bm->dma_hw_dev = get_device(dev->hw_dev);  in comedi_buf_map_alloc()
93 	bm->page_list = vzalloc(sizeof(*buf) * n_pages);  in comedi_buf_map_alloc()
94 	if (!bm->page_list)  in comedi_buf_map_alloc()
97 	if (bm->dma_dir != DMA_NONE) {  in comedi_buf_map_alloc()
105 		virt_addr = dma_alloc_coherent(bm->dma_hw_dev,  in comedi_buf_map_alloc()
112 			buf = &bm->page_list[i];  in comedi_buf_map_alloc()
117 		bm->n_pages = i;  in comedi_buf_map_alloc()
120 			buf = &bm->page_list[i];  in comedi_buf_map_alloc()
128 		bm->n_pages = i;  in comedi_buf_map_alloc()
133 	return bm;  in comedi_buf_map_alloc()
136 	comedi_buf_map_put(bm);  in comedi_buf_map_alloc()
146 	struct comedi_buf_map *bm;  in __comedi_buf_alloc()  local
157 	bm = comedi_buf_map_alloc(dev, s->async_dma_dir, n_pages);  in __comedi_buf_alloc()
158 	if (!bm)  in __comedi_buf_alloc()
162 	async->buf_map = bm;  in __comedi_buf_alloc()
165 	if (bm->dma_dir != DMA_NONE) {  in __comedi_buf_alloc()
170 		buf = &bm->page_list[0];  in __comedi_buf_alloc()
178 			buf = &bm->page_list[i];  in __comedi_buf_alloc()
190 void comedi_buf_map_get(struct comedi_buf_map *bm)  in comedi_buf_map_get()  argument
192 	if (bm)  in comedi_buf_map_get()
193 		kref_get(&bm->refcount);  in comedi_buf_map_get()
196 int comedi_buf_map_put(struct comedi_buf_map *bm)  in comedi_buf_map_put()  argument
198 	if (bm)  in comedi_buf_map_put()
199 		return kref_put(&bm->refcount, comedi_buf_map_kref_release);  in comedi_buf_map_put()
204 int comedi_buf_map_access(struct comedi_buf_map *bm, unsigned long offset,  in comedi_buf_map_access()  argument
211 	while (done < len && pg < bm->n_pages) {  in comedi_buf_map_access()
213 		void *b = bm->page_list[pg].virt_addr + pgoff;  in comedi_buf_map_access()
232 	struct comedi_buf_map *bm = NULL;  in comedi_buf_map_from_subdev_get()  local
239 	bm = async->buf_map;  in comedi_buf_map_from_subdev_get()
241 	if (bm && bm->n_pages)  in comedi_buf_map_from_subdev_get()
242 		comedi_buf_map_get(bm);  in comedi_buf_map_from_subdev_get()
244 		bm = NULL;  in comedi_buf_map_from_subdev_get()
247 	return bm;  in comedi_buf_map_from_subdev_get()
252 	struct comedi_buf_map *bm = s->async->buf_map;  in comedi_buf_is_mmapped()  local
254 	return bm && (kref_read(&bm->refcount) > 1);  in comedi_buf_is_mmapped()