2531 psf = state->im->mca_sources;
2532 }
2533out:
2534 return psf;
2535}
2536
2537static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2538{
2539 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2540 if (psf)
2541 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2542 --pos;
2543 return pos ? NULL : psf;
2544}
2545
2546static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2547 __acquires(dev_base_lock)
2548{
2549 read_lock(&dev_base_lock);
2550 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2551}
2552
2553static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2554{
2555 struct ip6_sf_list *psf;
2556 if (v == SEQ_START_TOKEN)
2557 psf = igmp6_mcf_get_first(seq);
2558 else
2559 psf = igmp6_mcf_get_next(seq, v);
2560 ++*pos;
2561 return psf;
2562}
2563
2564static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2565 __releases(dev_base_lock)
2566{
2567 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2568 if (likely(state->im != NULL)) {
2569 spin_unlock_bh(&state->im->mca_lock);
2570 state->im = NULL;
2571 }