2520 			  unsigned int to, struct skb_seq_state *st)  in skb_prepare_seq_read()  argument
2522 	st->lower_offset = from;  in skb_prepare_seq_read()
2523 	st->upper_offset = to;  in skb_prepare_seq_read()
2524 	st->root_skb = st->cur_skb = skb;  in skb_prepare_seq_read()
2525 	st->frag_idx = st->stepped_offset = 0;  in skb_prepare_seq_read()
2526 	st->frag_data = NULL;  in skb_prepare_seq_read()
2556 			  struct skb_seq_state *st)  in skb_seq_read()  argument
2558 	unsigned int block_limit, abs_offset = consumed + st->lower_offset;  in skb_seq_read()
2561 	if (unlikely(abs_offset >= st->upper_offset))  in skb_seq_read()
2565 	block_limit = skb_headlen(st->cur_skb) + st->stepped_offset;  in skb_seq_read()
2567 	if (abs_offset < block_limit && !st->frag_data) {  in skb_seq_read()
2568 		*data = st->cur_skb->data + (abs_offset - st->stepped_offset);  in skb_seq_read()
2572 	if (st->frag_idx == 0 && !st->frag_data)  in skb_seq_read()
2573 		st->stepped_offset += skb_headlen(st->cur_skb);  in skb_seq_read()
2575 	while (st->frag_idx < skb_shinfo(st->cur_skb)->nr_frags) {  in skb_seq_read()
2576 		frag = &skb_shinfo(st->cur_skb)->frags[st->frag_idx];  in skb_seq_read()
2577 		block_limit = skb_frag_size(frag) + st->stepped_offset;  in skb_seq_read()
2580 			if (!st->frag_data)  in skb_seq_read()
2581 				st->frag_data = kmap_atomic(skb_frag_page(frag));  in skb_seq_read()
2583 			*data = (u8 *) st->frag_data + frag->page_offset +  in skb_seq_read()
2584 				(abs_offset - st->stepped_offset);  in skb_seq_read()
2589 		if (st->frag_data) {  in skb_seq_read()
2590 			kunmap_atomic(st->frag_data);  in skb_seq_read()
2591 			st->frag_data = NULL;  in skb_seq_read()
2594 		st->frag_idx++;  in skb_seq_read()
2595 		st->stepped_offset += skb_frag_size(frag);  in skb_seq_read()
2598 	if (st->frag_data) {  in skb_seq_read()
2599 		kunmap_atomic(st->frag_data);  in skb_seq_read()
2600 		st->frag_data = NULL;  in skb_seq_read()
2603 	if (st->root_skb == st->cur_skb && skb_has_frag_list(st->root_skb)) {  in skb_seq_read()
2604 		st->cur_skb = skb_shinfo(st->root_skb)->frag_list;  in skb_seq_read()
2605 		st->frag_idx = 0;  in skb_seq_read()
2607 	} else if (st->cur_skb->next) {  in skb_seq_read()
2608 		st->cur_skb = st->cur_skb->next;  in skb_seq_read()
2609 		st->frag_idx = 0;  in skb_seq_read()
2624 void skb_abort_seq_read(struct skb_seq_state *st)  in skb_abort_seq_read()  argument
2626 	if (st->frag_data)  in skb_abort_seq_read()
2627 		kunmap_atomic(st->frag_data);  in skb_abort_seq_read()