[bug report] wifi: mt76: mt7996: Integrate MT7990 dma configuration for NPU

[Dan Carpenter]

Hello Lorenzo Bianconi,

Commit cd7951f242a7 ("wifi: mt76: mt7996: Integrate MT7990 dma
configuration for NPU") from Jan 22, 2026 (linux-next), leads to the
following Smatch static checker warning:

	drivers/net/wireless/mediatek/mt76/mt7996/dma.c:683 mt7996_dma_init()
	error: NULL dereference inside function mt7996_init_tx_queues()

drivers/net/wireless/mediatek/mt76/mt7996/dma.c
    664 int mt7996_dma_init(struct mt7996_dev *dev)
    665 {
    666         struct mtk_wed_device *wed = &dev->mt76.mmio.wed;
    667         struct mtk_wed_device *wed_hif2 = &dev->mt76.mmio.wed_hif2;
    668         u32 rx_base;
    669         u32 hif1_ofs = 0;
    670         int ret;
    671 
    672         mt7996_dma_config(dev);
    673 
    674         mt76_dma_attach(&dev->mt76);
    675 
    676         if (dev->hif2)
    677                 hif1_ofs = MT_WFDMA0_PCIE1(0) - MT_WFDMA0(0);
    678 
    679         mt7996_dma_disable(dev, true);
    680 
    681         /* init tx queue */
    682         if (is_mt7996(&dev->mt76) && mt76_npu_device_active(&dev->mt76))
--> 683                 ret = mt7996_init_tx_queues(&dev->phy, MT_TXQ_ID(0),
    684                                             MT7996_NPU_TX_RING_SIZE,
    685                                             MT_TXQ_RING_BASE(0) + hif1_ofs,
    686                                             NULL);
                                                    ^^^^
Can't pass NULL here.  It leads to a crash.  Use wed?

    687         else
    688                 ret = mt7996_init_tx_queues(&dev->phy,
    689                                             MT_TXQ_ID(dev->mphy.band_idx),
    690                                             MT7996_TX_RING_SIZE,
    691                                             MT_TXQ_RING_BASE(0), wed);
    692         if (ret)
    693                 return ret;
    694 

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regards,
dan carpenter