diff mbox series

[v4,1/2] wifi: ath11k: fix RCU stall while reaping monitor destination ring

Message ID 20241219110531.2096-2-quic_kangyang@quicinc.com
State New
Headers show
Series wifi: ath11k: fix full monitor mode for QCN9074 | expand

Commit Message

Kang Yang Dec. 19, 2024, 11:05 a.m. UTC 
From: P Praneesh <quic_ppranees@quicinc.com>

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: d5c65159f289 ("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>
---
 drivers/net/wireless/ath/ath11k/dp_rx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Vasanthakumar Thiagarajan Feb. 11, 2025, 7:19 a.m. UTC | #1 
On 12/19/2024 4:35 PM, Kang Yang wrote:
> From: P Praneesh <quic_ppranees@quicinc.com>
> 
> 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: d5c65159f289 ("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>

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
diff mbox series

Patch

diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index 029ecf51c9ef..07cd336ee01b 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -4783,7 +4783,7 @@  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) {
@@ -5410,7 +5410,7 @@  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);