Diagnosed via KFENCE splat on ohm (6.19.10-danctnix1, PineTab2):
sdio_tx_work passes block-size-aligned length to dma_map_sg while
the underlying skb linear head is only tx_buffer->len long. Fix:
driver-owned DMA bounce page, memcpy + zero-pad per TX buffer.
Both Mobian paths and drivers/staging/bes2600/ paths variants,
checkpatch-clean.
