On 29 July 2015 at 02:04, Martin Blumenstingl <[email protected]> wrote: > Hi Michal, > > sorry for the delay, I was very busy for the past week. > But now I am back with news. > To keep it simple, all of my new findings below are with ath10k > firmware 10.2.4.70-2. > The wireless drivers were also updated in OpenWrt: "Loading modules > backported from Linux version master-2015-07-21-0-g47cd203" > > On Thu, Jul 23, 2015 at 7:50 AM, Michal Kazior <[email protected]> > wrote: >> Yes, this should be enough. You'll want to add/keep a print to know >> how many SWBA event come in though. > I have used this patch [0] to make ath10k_wmi_event_host_swba only do > printk("%s()\n", __func__); > Result: firmware is not crashing - kernel log can be seen here: [1] > >> Perhaps not submitting beacons will prevent the crash or it'll postpone it >> until >> after more SWBA events are delivered than before. > I also tried that by #if 0'ing everything starting at "if > (!arvif->beacon_buf)" until "trace_ath10k_tx_payload(ar, bcn->data, > bcn->len);". The patch for this can be seen here: [2] > The result: firmware is still not crashing - kernel log can be seen here: [3] > > Without any patches at all (only a printk at the start of > ath10k_wmi_event_host_swba), this is the result the same as with old > wireless driver versions: firmware crashes, see [5] > > Let me know what the next steps are - I'm sure we can fix this nasty bug! :-)
Awesome report, thanks! It's good we narrowed the problem down to beacon transmission. I can't get smart antenna out of my head at this point - it wasn't supported in 10.1 firmware (which works with your device). However 10.2 seems to report that your hardware itself isn't capable of it so it shouldn't be a problem (in theory). I guess you could try playing with the WMI_BCN_TX_REF_DEF_ANTENNA in the driver and try things like: 0x1, 0x7, 0xf, 0xff, 0xff00, 0xffff, 0xff0000, 0xffffff. I doubt it'll help though. I guess other management frames would crash firmware as well but I don't think they do. Can you verify that by running scan from any station around to see if the ath10k AP responds with a Probe Response and is hence visible in station's scan results, please? Michał _______________________________________________ ath10k mailing list [email protected] http://lists.infradead.org/mailman/listinfo/ath10k
