This series implements custom wake_tx_queue operations for ath11k and
ath12k drivers to prevent hardware ring overflow issues under heavy
traffic.

Without proper flow control, both drivers experience -ENOMEM errors
("failed to transmit frame -12") when the hardware TCL ring fills up.
Additionally, ath12k can hang under sustained high throughput. These
issues are more commonly observed in VMs with PCIe passthrough but
also occur on bare metal systems.

The implementation follows the pattern used in the iwlwifi driver,
adapted for ath11k/ath12k hardware ring architecture, checking
hardware ring space before dequeuing packets from mac80211.

Testing shows stable operation with eliminated -ENOMEM errors, no hangs,
and improved throughput under heavy traffic conditions.

Jose Ignacio Tornos Martinez (4):
  wifi: ath11k: use queue mapping for WCN6750 ring selection
  wifi: ath11k/ath12k: remove skb parameter from get_ring_selector
  wifi: ath11k: implement custom wake_tx_queue with flow control
  wifi: ath12k: implement custom wake_tx_queue with flow control

v7: No modification in patches 1 and 2
    Address comments from Jeff Johnson:
      Patch 3: Add the defensive pattern _bh in both spinlocks (ath11k)
      Patch 4: Add the defensive pattern _bh in both spinlocks (ath12k)
v6: https://lore.kernel.org/all/20260811172435.616200-1-jtornosm@redhat.com/
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2.49.0