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mappings bus_dma(9) states: "In the event that the DMA handle contains a valid mapping, the mapping will be unloaded via the same mechanism used by bus_dmamap_unload()." And some drivers do mean to skip the unload step.
mappings bus_dma(9) states: "In the event that the DMA handle contains a valid mapping, the mapping will be unloaded via the same mechanism used by bus_dmamap_unload()." And some drivers do mean to skip the unload step.