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mt76: fix potential DMA mapping leak
With buf uninitialized in mt76_dma_tx_queue_skb_raw, its field skip_unmap could potentially inherit a non-zero value from stack garbage. If this happens, it will cause DMA mappings for MCU command frames to not be unmapped after completion Fixes: 27d5c528a7ca ("mt76: fix double DMA unmap of the first buffer on 7615/7915") Cc: stable@vger.kernel.org Signed-off-by: Felix Fietkau <nbd@nbd.name>
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