Messages in this thread | | | Date | Mon, 26 Nov 2018 11:46:39 +0100 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH 1/1] thunderbolt: Prevent root port runtime suspend during NVM upgrade |
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On Mon, Nov 26, 2018 at 12:47:46PM +0300, Mika Westerberg wrote: > During NVM upgrade process the host router is hot-removed for a short > while. During this time it is possible that the root port is moved into > D3cold which would be fine if the root port could trigger PME on itself. > However, many systems actually do not implement it so what happens is > that the root port goes into D3cold and never wakes up unless userspace > does PCI config space access, such as running 'lscpi'. > > For this reason we explicitly prevent the root port from runtime > suspending during NVM upgrade. > > Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> > --- > drivers/thunderbolt/switch.c | 40 ++++++++++++++++++++++++++++++++++-- > 1 file changed, 38 insertions(+), 2 deletions(-)
Is this a regression? If so, should it go to stable kernels?
If not, and this never worked, should this just wait until 4.21-rc1?
thanks,
greg k-h
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