[PATCH 1/3] wifi: ath12k: fix datapath lookup in ath12k_wifi7_dp_rx_process_err()

[Lorenzo Bianconi]

ath12k_wifi7_dp_rx_process_err() resolves the per-pdev datapath with
ath12k_dp_to_pdev_dp(dp, pdev_idx), using the local 'dp', while
'pdev_idx' is computed from the owning 'partner_dp'. As dp_pdevs[] is
indexed per ath12k_dp, this picks the wrong pdev when the REO exception
descriptor was sourced by a partner device in a multi-device group.

The error is currently masked by the drop condition that only processes
same-device fragments (partner_dp->device_id == dp->device_id), but it
is still incorrect and would misbehave as soon as that restriction is
relaxed.

Look the pdev datapath up from partner_dp, as already done in the other
Rx processing paths.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
Fixes: 9e0ee04f818f ("wifi: ath12k: Refactor data path pdev struct")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi at oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c b/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c
index a32c804403e8..633cb91b9e5d 100644
--- a/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c
+++ b/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c
@@ -1536,7 +1536,7 @@ int ath12k_wifi7_dp_rx_process_err(struct ath12k_dp *dp, struct napi_struct *nap
 
 		rcu_read_lock();
 
-		dp_pdev = ath12k_dp_to_pdev_dp(dp, pdev_idx);
+		dp_pdev = ath12k_dp_to_pdev_dp(partner_dp, pdev_idx);
 		if (!dp_pdev) {
 			rcu_read_unlock();
 			continue;

-- 
2.56.0