[PATCH ath-next] wifi: ath12k: skip MLO multicast links during crash recovery in Tx path

[Pavankumar Nandeshwar]

In ath12k_wifi7_mac_op_tx(), the MLO multicast broadcast path iterates
over all active links and copies the original skb for transmission on
each link. When firmware crash recovery is underway (ATH12K_FLAG_CRASH_FLUSH
set), the per-link copy is allocated and partially processed before
ath12k_wifi7_dp_tx() eventually rejects it with -ESHUTDOWN.

This wastes GFP_ATOMIC memory and produces spurious "failed to transmit
frame" warnings for every active MLO link during the recovery window.
The unicast and non-MLO paths are unaffected: they call ath12k_wifi7_dp_tx()
directly, which already guards against the flag at its entry.

Skip any link whose associated ath12k_base has ATH12K_FLAG_CRASH_FLUSH set
before performing the skb_copy(), matching the behaviour of
ath12k_wifi7_dp_tx() but avoiding the unnecessary allocation entirely.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01243-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3

Signed-off-by: Pavankumar Nandeshwar <pavankumar.nandeshwar at oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/wifi7/hw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/wifi7/hw.c b/drivers/net/wireless/ath/ath12k/wifi7/hw.c
index 1ab1168510aa..2e17bd665dc9 100644
--- a/drivers/net/wireless/ath/ath12k/wifi7/hw.c
+++ b/drivers/net/wireless/ath/ath12k/wifi7/hw.c
@@ -1029,6 +1029,9 @@ static void ath12k_wifi7_mac_op_tx(struct ieee80211_hw *hw,
 				continue;
 
 			tmp_ar = tmp_arvif->ar;
+			if (unlikely(test_bit(ATH12K_FLAG_CRASH_FLUSH, &tmp_ar->ab->dev_flags)))
+				continue;
+
 			tmp_dp = ath12k_ab_to_dp(tmp_ar->ab);
 			tmp_dp_pdev = ath12k_dp_to_pdev_dp(tmp_dp,
 							   tmp_ar->pdev_idx);

base-commit: 90883c513ca01e77c56b8d94be7de11420c1dacf
-- 
2.34.1