On Thu, 2012-06-07 at 10:07 -0700, Andi Kleen wrote: > Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> 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 > > > > It doesn't. We also have hardware which craps itself if you clear the bus > > mastering bit and we have platforms where the BIOS gets most upset if you > > do that on suspend paths. There are also lots of devices that simply > > ignore the bus mastering bit ! > > But it also makes my system do kexec successfully for the first time. > > Maybe can make it an option. > > n-Andi > Hi Andi, That makes my day :) It will be very helpful to see which PCI devices your system has. I was thinking about kernel command line option this morning and had started looking at reset_devices option to see if I could leverage that one in any way. -- ==================================================================== Khalid Aziz Unix Systems Lab (970)898-9214 Hewlett-Packard khalid.aziz@xxxxxx Fort Collins, CO -- 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
