Re: diagnosing resume failures after disconnected USB4 drives (Was: Re: PCI/ASPM: Fix L1SS saving (linus/master commit 7507eb3e7bfac))

[Kenneth Crudup]

On 2/28/25 08:04, Kenneth Crudup wrote:

> Don't worry about the printk()s WRT to the code; a couple of weeks ago 
> I'd seen an NPE on resume in __tb_path_deactivate_hop so threw in a 
> bunch of tb_port_info(port, "%s(): %d\n", __func__, __LINE__); so I 
> could get an idea of where the crash was.

I've started a separate E-mail about this, but I'd determined those 
crashes were due to d6d458d42e1 ("Handle DisplayPort tunnel activation 
asynchronously").

Since reverting 9d573d1954 and d6d458d42e1 I've been testing several 
resume scenarios (NVMe connected/disconnected and/or external 
DP-tunneled monitor connected/disconnected and have yet to have a resume 
or hibernate failure over several cycles.

Now, how do I help you guys go about fixing these commits?

-K

--
Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange 
County CA