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
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