Frequent ath10k crashes with QCA6174 on kernels 4.16 and 4.17

From: "Timur Kristóf" <timur.kristof@gmail.com>
To: ath10k@lists.infradead.org
Subject: Frequent ath10k crashes with QCA6174 on kernels 4.16 and 4.17
Date: Tue, 29 May 2018 11:52:15 +0300	[thread overview]
Message-ID: <c92e04d5b80af2a640ab97efce32d987ffb27ffe.camel@gmail.com> (raw)

Hi,

I'm experiencing a lot of ath10k driver crashes on both 4.16 (as
shipped in Fedora) and 4.17 (tried rc5 and rc6) using a Dell XPS 13
9370 with a QCA6174.

With 4.16 the driver crash always results in the whole system hanging.
With 4.17 it does not always hang the system completely, but it still
happends. I also tried to upgrade the firmware which also reduces the
frequency of the crashes but does not eliminate them completely.

The common pattern I see in dmesg is this:
[30372.900832] wlp2s0: AP 64:7c:34:3f:c3:b0 changed bandwidth, new config is 2437 MHz, width 2 (2447/0 MHz)

Searching a bit in kernel sources, this message is printed by this line:
https://github.com/torvalds/linux/blob/master/net/mac80211/mlme.c#L364
And width 2 seems to correspond to NL80211_CHAN_WIDTH_40 here:
https://github.com/torvalds/linux/blob/master/include/uapi/linux/nl80211.h#L3880

So it seems that either the driver or the firmware can't cope with it when the AP changes the bandwidth.
Here is the Fedora bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=1577106

Is there anything that can be done to improve the stability of ath10k on this system?
I see there is a lot going on in the upstream repo, but not sure which branch to try: ath-next or qca?

Best regards,
Tim

ps. I'm not on the mailing list, please add me to CC when you reply. Thanks.

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