On Wed, Jul 08, 2015 at 03:41:42PM +0800, Jiang Liu wrote: > The dmaengine core assumes that async DMA devices will only be removed > when they not used anymore, or it assumes dma_async_device_unregister() > will only be called by dma driver exit routines. But this assumption is > not true for the IOAT driver, which calls dma_async_device_unregister() > from ioat_remove(). So current IOAT driver doesn't support device > hot-removal because it may cause system crash to hot-remove an inuse > IOAT device. > > To support CPU socket hot-removal, all PCI devices, including IOAT > devices embedded in the socket, will be hot-removed. The idea solution > is to enhance the dmaengine core and IOAT driver to support hot-removal, > but that's too hard. > > This patch implements a hack to disable IOAT devices under hotplug-capable > CPU socket so it won't break socket hot-removal. Applied now, please ensure you use the right subsystem name -- ~Vinod -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
