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wifi: ath11k: fix RCU stall while reaping monitor destination ring

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While processing the monitor destination ring, MSDUs are reaped from the
link descriptor based on the corresponding buf_id.

However, sometimes the driver cannot obtain a valid buffer corresponding
to the buf_id received from the hardware. This causes an infinite loop
in the destination processing, resulting in a kernel crash.

kernel log:
ath11k_pci 0000:58:00.0: data msdu_pop: invalid buf_id 309
ath11k_pci 0000:58:00.0: data dp_rx_monitor_link_desc_return failed
ath11k_pci 0000:58:00.0: data msdu_pop: invalid buf_id 309
ath11k_pci 0000:58:00.0: data dp_rx_monitor_link_desc_return failed

Fix this by skipping the problematic buf_id and reaping the next entry,
replacing the break with the next MSDU processing.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1

Fixes: d5c65159f2 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: P Praneesh <quic_ppranees@quicinc.com>
Signed-off-by: Kang Yang <quic_kangyang@quicinc.com>
Acked-by: Kalle Valo <kvalo@kernel.org>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://patch.msgid.link/20241219110531.2096-2-quic_kangyang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
This commit is contained in:
P Praneesh 2024-12-19 19:05:30 +08:00 committed by Jeff Johnson
parent 81e4be3054
commit 16c6c35c03
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/ath/ath11k/dp_rx.c
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@ -4772,7 +4772,7 @@ u32 ath11k_dp_rx_mon_mpdu_pop(struct ath11k *ar, int mac_id,
if (!msdu) {
ath11k_dbg(ar->ab, ATH11K_DBG_DATA,
"msdu_pop: invalid buf_id %d\n", buf_id);
break;
goto next_msdu;
}
rxcb = ATH11K_SKB_RXCB(msdu);
if (!rxcb->unmapped) {
@ -5399,7 +5399,7 @@ ath11k_dp_rx_full_mon_mpdu_pop(struct ath11k *ar,
"full mon msdu_pop: invalid buf_id %d\n",
buf_id);
spin_unlock_bh(&rx_ring->idr_lock);
break;
goto next_msdu;
}
idr_remove(&rx_ring->bufs_idr, buf_id);
spin_unlock_bh(&rx_ring->idr_lock);