Hi Felix,
How are things in OpenWRT. I wanted to ask you something regarding a
defect I am looking at. Since kernel 3.9 several reports have been made
about a kernel panic in brcmsmac, ie. a divide-by-zero error.
Debugging the issue shows we end up with a rate with MCS index 110,
which is, well, impossible. As brcmsmac gets the rate info from
minstrel_ht I was wondering if we have an intergration issue here. I saw
around April patches about new API which may have been in the 3.9 time
frame and something subtly changed things for brcmsmac.
Regards,
Arend
-------- Original Message --------
Subject: [Bug 989269] Connecting to WLAN causes kernel panic
Date: Wed, 31 Jul 2013 08:11:41 +0000
From: <bugzilla@xxxxxxxxxx>
To: <fedora-kernel-wireless-brcm80211@xxxxxxxxxxxxxxxxx>
https://bugzilla.redhat.com/show_bug.cgi?id=989269
--- Comment #13 from Arend van Spriel <arend@xxxxxxxxxxxx> ---
(In reply to Chris from comment #12)
Created attachment 780839 [details]
dmesg | grep brcms when connecting to WLAN after patch 2
During gathering this data I connected to the internet, was sitting for a
while and then walked through a corridor in my university, so that the
computer was connecting to different routers. Sat down there for
significantly longer time. At the end I reconnected and disconnected.
It seems to work stable, without any problems, but I haven't tried to use
the connection for something heavier.
Thanks for the data. I observed two values that are invalid. ratespec
value 0
is invalid and the driver selects 1Mbps rate to do the calculation. The
other
value 134217838 is what triggers the divide-by-zero. The ratespec value is:
ratespec: 0x800006E
RATE 110 (rate value [unit: 500Kbps or MCS index])
MIMORATE 1 (RATE field represents MIMO MCS index)
This does not make sense, because MCS index can only go up to 32. I suspect
this should not be a mimo rate, but 54Mbps. Looking further how we end up in
this situation.
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