Commit f12cb289 authored by Pontus Fuchs's avatar Pontus Fuchs Committed by Johannes Berg
Browse files

nl80211: Reset split_start when netlink skb is exhausted

When the netlink skb is exhausted split_start is left set. In the
subsequent retry, with a larger buffer, the dump is continued from the
failing point instead of from the beginning.

This was causing my rt28xx based USB dongle to now show up when
running "iw list" with an old iw version without split dump support.

Cc: stable@vger.kernel.org
Fixes: 3713b4e3

 ("nl80211: allow splitting wiphy information in dumps")
Signed-off-by: default avatarPontus Fuchs <pontus.fuchs@gmail.com>
[avoid the entire workaround when state->split is set]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 2f617435
......@@ -1719,9 +1719,10 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
* We can then retry with the larger buffer.
*/
if ((ret == -ENOBUFS || ret == -EMSGSIZE) &&
!skb->len &&
!skb->len && !state->split &&
cb->min_dump_alloc < 4096) {
cb->min_dump_alloc = 4096;
state->split_start = 0;
rtnl_unlock();
return 1;
}
......
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