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wifi: mt76: restrict NPU/PPE active checks to MMIO devices

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mt76_npu_device_active() and mt76_ppe_device_active() read dev->mmio.npu
and dev->mmio.ppe_dev. The mmio, usb and sdio bus structs share a union in
struct mt76_dev, so on USB and SDIO these read unrelated data from the
usb/sdio struct, which is non-NULL in practice.

mt76_npu_device_active() then returns true on USB, and
mt76_rx_poll_complete() takes the offload path and skips
mt76_rx_aggr_reorder(). RX A-MPDU subframes are delivered out of order and
the peer's TCP stack treats that as loss: heavy retransmissions and reduced
throughput in AP mode. Seen on mt7921u, mt7925u, mt76x2u and mt76x0u.

Gate both helpers on mt76_is_mmio() so they only run for the bus type that
owns the mmio union member.

Fixes: 7fb554b1b623 ("wifi: mt76: Introduce the NPU generic layer")
Cc: [email protected]
Tested-by: Nick Morrow <[email protected]>
Signed-off-by: Devin Wittmayer <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Devin Wittmayer
2026-07-21 15:34:22 +02:00
committed by Felix Fietkau
parent e053e8c780
commit 2d9b52d224
1 changed files with 2 additions and 2 deletions
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mt76.h
+2 -2
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@@ -1752,12 +1752,12 @@ static inline int mt76_npu_send_txrx_addr(struct mt76_dev *dev, int ifindex,
static inline bool mt76_npu_device_active(struct mt76_dev *dev)
{
return !!rcu_access_pointer(dev->mmio.npu);
return mt76_is_mmio(dev) && !!rcu_access_pointer(dev->mmio.npu);
}
static inline bool mt76_ppe_device_active(struct mt76_dev *dev)
{
return !!rcu_access_pointer(dev->mmio.ppe_dev);
return mt76_is_mmio(dev) && !!rcu_access_pointer(dev->mmio.ppe_dev);
}
static inline int mt76_npu_send_msg(struct airoha_npu *npu, int ifindex,