On Thu, May 31, 2012 at 06:39:51PM +0200, Jean-Pierre TOSONI wrote: > Hello all, > > I am using compat-wireless-2012-04-17 in a OpenWrt box, client mode, > kernel 2.6.33. > I arrange to run an active background scan every second under some load > (iperf UDP 40 Mbps). > > I observed that the probes can be delayed due to two events flagged as > IEEE80211_STA_BEACON_POLL and IEEE80211_STA_CONNECTION_POLL. They make > __ieee80211_start_scan() return early in mac80211/scan.c when it is > called by ieee80211_request_scan(). > > When one of these events occurs, the function returns and > __ieee80211_start_scan() is reentered later, called this time by > ieee80211_scan_work(). Now if it finds the other event flagged, it > returns early but will never be called again. As a result later scan > requests result in a "EBUSY" error. > > I made a workaround by always returning an error, but I am pretty sure > this is a wrong solution. I wonder if scan_work should not be > rescheduled in this case. I posted fix here: http://marc.info/?l=linux-wireless&m=133717501822158&w=2 It is needed for 3.5 and it is still not appied in wireless-testing ... Stanislaw -- 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
