[PATCH AUTOSEL 4.9 24/64] ath10k: wmi: disable softirq's while calling ieee80211_rx

Sasha Levin
2019-11-08T11:46:39Z

From: Erik Stromdahl <erik.stromdahl@gmail.com>

[ Upstream commit 37f62c0d5822f631b786b29a1b1069ab714d1a28 ]

This is done in order not to trig the below warning in
ieee80211_rx_napi:

WARN_ON_ONCE(softirq_count() == 0);

ieee80211_rx_napi requires that softirq's are disabled during
execution.

The High latency bus drivers (SDIO and USB) sometimes call the wmi
ep_rx_complete callback from non softirq context, resulting in a trigger
of the above warning.

Calling ieee80211_rx_ni with softirq's already disabled (e.g., from
softirq context) should be safe as the local_bh_disable and
local_bh_enable functions (called from ieee80211_rx_ni) are fully
reentrant.

Signed-off-by: Erik Stromdahl <erik.stromdahl@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/ath/ath10k/wmi.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index bbfe7be214e12..c208fed048554 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -2384,7 +2384,8 @@ int ath10k_wmi_event_mgmt_rx(struct ath10k *ar, struct sk_buff *skb)
status->freq, status->band, status->signal,
status->rate_idx);

- ieee80211_rx(ar->hw, skb);
+ ieee80211_rx_ni(ar->hw, skb);
+
return 0;
}

--
2.20.1