Matthew Garrett <mjg@xxxxxxxxxx> writes: > > This protects against the case where a piece of hardware is continuing > to DMA even after the driver shutdown method has been called? I'm not > convinced this is safe. Some Broadcom parts will crash if busmastering > is disabled while they're still performing DMA, and they'll then hang > the bus if reenabled. There's also the risk that the hardware will start > DMAing again if it's reenabled after being shut down. It seems like > you're covering over the case where the driver didn't correctly quiesce > the hardware, but you risk triggering other bugs instead. One alternative I've been pondering some time is to use AER link reset instead. But this is mainly on servers, a lot of clients don't have it. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
