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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: 3713b4e364 ("nl80211: allow splitting wiphy information in dumps")
Signed-off-by: Pontus Fuchs <pontus.fuchs@gmail.com>
[avoid the entire workaround when state->split is set]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Pontus Fuchs 2014-01-16 15:00:40 +01:00 committed by Johannes Berg
parent 2f617435c3
commit f12cb28930
1 changed files with 2 additions and 1 deletions
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3
net/wireless/nl80211.c
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@ -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. * We can then retry with the larger buffer.
*/ */
if ((ret == -ENOBUFS || ret == -EMSGSIZE) && if ((ret == -ENOBUFS || ret == -EMSGSIZE) &&
!skb->len && !skb->len && !state->split &&
cb->min_dump_alloc < 4096) { cb->min_dump_alloc < 4096) {
cb->min_dump_alloc = 4096; cb->min_dump_alloc = 4096;
state->split_start = 0;
rtnl_unlock(); rtnl_unlock();
return 1; return 1;
} }