> If the device you're passing has a NULL dma_mask pointer that means the > platform hasn't set it up correctly for dma ... and that's the Well it may not do DMA. > underlying problem (although it's not necessarily a libata problem): you > can't call dma_ operations on a device that hasn't been set up in the > platform for it. Right. Ok so what is the right way given a random *correctly* set up device that may or may not be DMA capable to determine this. Its an arbitary device pointer for an arbitary device class on an arbitary platform which may or may not support DMA for this device class ? Can I called dma_alloc_coherent and get a NULL back or do we need a device_can_dma() check in each platform ? Alan - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
