Re: [PATCH] PCI: Disable RRS polling for Intel SSDPE2KX020T8 nvme

[Bjorn Helgaas <helgaas@kernel.org>]

On Sun, Feb 08, 2026 at 10:30:39PM +0100, Linux-Fan wrote:
> Linux regression tracking (Thorsten Leemhuis) writes:
> > The issue discussed in this thread is still on my list of tracked
> > regression, which got me wondering what's the status here. Did it
> > fall through the cracks? Or was the regression maybe fixed already
> > and I just missed it?

> I am one of the users affected by this issue and are currently
> running an old Linux version (Linux 6.1 from Debian oldstable) to
> work around it. As a user I would very much appreciate an upstream
> fix.
> 
> The Debian bug is still open
> <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1112238> whereas
> I think Ubuntu got a patch working around the issue for their users:
> <https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2111521>
> 
> Is there a chance to possibly include the workaround in the
> upstream?
> 
> As the issue is reproducible on my system, I should be able to test
> some patches if necessary. Tests are not easy to perform because it
> degrades the RAID system and I would like to avoid damaging my
> “production” data hence limit the tests to the required minimum.
> 
> But if there is some real doubt that the issue is still present,
> tell me and I check it again with a more recent kernel version?

As far as I know this issue still exists, and it has unfortunately
fallen through the cracks, mostly because I don't have a good idea how
to debug it.

Thanks for keeping it alive.  I'll try to come up with some ideas.

> > On 10/8/25 18:53, Bjorn Helgaas wrote:
> > > Nirmal, Jonathan, can you confirm that when RRS SV is enabled for VMD
> > > Root Ports, we should actually see the 0x0001 value when a device
> > > downstream of VMD responds with RRS?  From the log below, it appears
> > > that we actually get 0xffffffff when reading Device ID after a reset.
> > >
> > > On Thu, Aug 21, 2025 at 11:39:36AM -0500, Bjorn Helgaas wrote:
> > >> On Thu, Jul 03, 2025 at 08:05:05AM +0800, Hui Wang wrote:
> > >>> On 7/2/25 17:43, Hui Wang wrote:
> 
> [...]
> 
> > > The patch is here:
> > > https://lore.kernel.org/r/20250701232341.GA1859056@bhelgaas
> > > and the log with that patch is here:
> 
> [...]