4.4-stable review patch. If anyone has any objections, please let me know.
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From: Martin Willi martin@strongswan.org
[ Upstream commit a9911937e7d332761e8c4fcbc7ba0426bdc3956f ]
When running in AP mode, ath10k sometimes suffers from TX credit starvation. The issue is hard to reproduce and shows up once in a few days, but has been repeatedly seen with QCA9882 and a large range of firmwares, including 10.2.4.70.67.
Once the module is in this state, TX credits are never replenished, which results in "SWBA overrun" errors, as no beacons can be sent. Even worse, WMI commands run in a timeout while holding the conf mutex for three seconds each, making any further operations slow and the whole system unresponsive.
The firmware/driver never recovers from that state automatically, and triggering TX flush or warm restarts won't work over WMI. So issue a hardware restart if a WMI command times out due to missing TX credits. This implies a connectivity outage of about 1.4s in AP mode, but brings back the interface and the whole system to a usable state. WMI command timeouts have not been seen in absent of this specific issue, so taking such drastic actions seems legitimate.
Signed-off-by: Martin Willi martin@strongswan.org Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/ath/ath10k/wmi.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/net/wireless/ath/ath10k/wmi.c +++ b/drivers/net/wireless/ath/ath10k/wmi.c @@ -1749,6 +1749,12 @@ int ath10k_wmi_cmd_send(struct ath10k *a if (ret) dev_kfree_skb_any(skb);
+ if (ret == -EAGAIN) { + ath10k_warn(ar, "wmi command %d timeout, restarting hardware\n", + cmd_id); + queue_work(ar->workqueue, &ar->restart_work); + } + return ret; }