From: Johannes Berg <johannes.berg@xxxxxxxxx> Use the new consistent dump feature from (generic) netlink to advertise when dumps are incomplete. Readers may note that this does not initialize the rdev->bss_generation counter to a non-zero value. This is still OK since the value is modified only under spinlock when the list is modified. Since the dump code holds the spinlock, the value will either be > 0 already, or the list will still be empty in which case a consistent dump will actually be made (and be empty). Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> --- net/wireless/nl80211.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/net/wireless/nl80211.c 2011-06-20 13:34:43.000000000 +0200 +++ b/net/wireless/nl80211.c 2011-06-20 13:39:58.000000000 +0200 @@ -3620,7 +3620,8 @@ static int nl80211_stop_sched_scan(struc return __cfg80211_stop_sched_scan(rdev, false); } -static int nl80211_send_bss(struct sk_buff *msg, u32 pid, u32 seq, int flags, +static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb, + u32 seq, int flags, struct cfg80211_registered_device *rdev, struct wireless_dev *wdev, struct cfg80211_internal_bss *intbss) @@ -3632,11 +3633,13 @@ static int nl80211_send_bss(struct sk_bu ASSERT_WDEV_LOCK(wdev); - hdr = nl80211hdr_put(msg, pid, seq, flags, + hdr = nl80211hdr_put(msg, NETLINK_CB(cb->skb).pid, seq, flags, NL80211_CMD_NEW_SCAN_RESULTS); if (!hdr) return -1; + genl_dump_check_consistent(cb, hdr, &nl80211_fam); + NLA_PUT_U32(msg, NL80211_ATTR_GENERATION, rdev->bss_generation); NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, wdev->netdev->ifindex); @@ -3725,11 +3728,12 @@ static int nl80211_dump_scan(struct sk_b spin_lock_bh(&rdev->bss_lock); cfg80211_bss_expire(rdev); + cb->seq = rdev->bss_generation; + list_for_each_entry(scan, &rdev->bss_list, list) { if (++idx <= start) continue; - if (nl80211_send_bss(skb, - NETLINK_CB(cb->skb).pid, + if (nl80211_send_bss(skb, cb, cb->nlh->nlmsg_seq, NLM_F_MULTI, rdev, wdev, scan) < 0) { idx--; -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html