On 11/27/2013 03:07 PM, Matthew Garrett wrote: > On Wed, Nov 27, 2013 at 02:01:06PM -0800, Greg KH wrote: >> Anyway, I really don't care either way, but this seems like something >> that the drivers should be doing. What suddenly changed that caused >> this problem to occur that hasn't happened in the years prior to now >> that drives this to be a stable-kernel issue? > > We started clearing the busmaster bit on all devices on shutdown in > 3.something in order to ensure that DMA wasn't occuring while we were > in the process of performing a kexec. Some machines freeze on shutdown > as a result. This patch reverts back to the original behaviour on real > shutdown, while still avoiding the "This PCI device scribbled over my > new kernel" kexec case. > Thanks for explaining this, Matthew. That was my reasoning exactly for why this patch should apply to stable. It fixes a real problem some users are experiencing. Commit log contains the URL to bugzilla entry for the problem. -- Khalid
