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SubjectRe: [BISECTED REGRESSION] Wireless networking kernel crashes
From
On 2021-11-18 14:25, Aaro Koskinen wrote:
> Hello,
>
> I have tried to upgrade my wireless AP (Raspberry Pi with rt2x00usb)
> from v5.9 to the current mainline, but now it keeps crashing every hour
> or so, basically making my wireless network unusable.
>
> I have bisected this to:
>
> commit 03c3911d2d67a43ad4ffd15b534a5905d6ce5c59
> Author: Ryder Lee <ryder.lee@mediatek.com>
> Date: Thu Jun 17 18:31:12 2021 +0200
>
> mac80211: call ieee80211_tx_h_rate_ctrl() when dequeue
>
> With the previous commit the system stays up for weeks...
>
> I just tried today's mainline, and it crashed after 10 minutes:
Please test if this patch fixes the issue:

---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1822,15 +1822,15 @@ static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
ieee80211_tx_result res = TX_CONTINUE;

+ if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
+ CALL_TXH(ieee80211_tx_h_rate_ctrl);
+
if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
__skb_queue_tail(&tx->skbs, tx->skb);
tx->skb = NULL;
goto txh_done;
}

- if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
- CALL_TXH(ieee80211_tx_h_rate_ctrl);
-
CALL_TXH(ieee80211_tx_h_michael_mic_add);
CALL_TXH(ieee80211_tx_h_sequence);
CALL_TXH(ieee80211_tx_h_fragment);
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