Re: [PATCH v22 0/9] shut down devices asynchronously

[David Jeffery]

On Thu, Sep 17, 2026 at 12:37 PM David Jeffery <djeffery@xxxxxxxxxx> wrote:
>
> These patches are rebased against the driver-core tree's driver-core-next
> branch and should also apply against recent linux-next. Changes for v18 are
> contained in patch 3.
>
> This patchset allows the kernel to shutdown devices asynchronously and
> unrelated async devices to be shut down in parallel to each other.
>
> Only devices which explicitly enable it are shut down asynchronously. The
> default is for a device to be shut down from the synchronous shutdown loop.
>
> This can dramatically reduce system shutdown/reboot time on systems that
> have multiple devices that take many seconds to shut down (like certain
> NVMe drives). On one system tested, the shutdown time went from 11 minutes
> without this patch to 55 seconds with the patch. And on another system from
> 80 seconds to 11.
>
> And thank you to everyone who has spent some of their valuable time
> providing reviews, suggestions, criticisms, or tests on the various
> iterations of this patchset.
>
> Changes from V21:
> - Check a device is alive before accessing its bus pointer
>

And this has resolved Sashiko's last complaint. Sashiko found no
issues with the v22 patchset.

David Jeffery