Re: [6.18.y] Fixes for USB4/NVME hotplugging

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, Feb 04, 2026 at 02:06:15PM -0600, Mario Limonciello wrote:
> Hi,
> 
> Some of my colleagues (on CC) have been chasing an issue where some
> percentage of the time USB4 NVME enclosures weren't working properly on
> hotplug.  They narrowed down the PCIe traces and found that it was caused by
> a race condition between multiple drivers shortly after link training.
> 
> This issue traces back a while, they reproduced it as far back as 6.14, but
> that's mostly because the hardware it was first reproduced on had graphics
> enabled in 6.14.  Given the root cause, I strongly hardware enabled with
> earlier kernels would also reproduce it.  Nonetheless the issue has actually
> already been fixed though by a series that went into 6.19.
> 
> commit a2f1e22390ac ("PCI/ERR: Ensure error recoverability at all times")
> commit 383d89699c50 ("treewide: Drop pci_save_state() after
> pci_restore_state()")
> 
> Can we bring this back to 6.18.y too?
> 
> If any questions about the methodology or details, they can add more.

Now queued up, thanks.

greg k-h