2488 spin_lock_bh(&state->im->lock);
2489 psf = state->im->sources;
2490 }
2491out:
2492 return psf;
2493}
2494
2495static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2496{
2497 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2498 if (psf)
2499 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2500 --pos;
2501 return pos ? NULL : psf;
2502}
2503
2504static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2505{
2506 read_lock(&dev_base_lock);
2507 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2508}
2509
2510static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2511{
2512 struct ip_sf_list *psf;
2513 if (v == SEQ_START_TOKEN)
2514 psf = igmp_mcf_get_first(seq);
2515 else
2516 psf = igmp_mcf_get_next(seq, v);
2517 ++*pos;
2518 return psf;
2519}
2520
2521static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2522{
2523 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2524 if (likely(state->im != NULL)) {
2525 spin_unlock_bh(&state->im->lock);
2526 state->im = NULL;
2527 }
2528 if (likely(state->idev != NULL)) {