[Bug 215880] Resume process hangs for 5-6 seconds starting sometime in 5.16

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215880

--- Comment #41 from Damien Le Moal (damien.lemoal@wdc.com) ---
(In reply to jason600 from comment #40)
> I have been using Damien Lemoal's patch for the last couple of days on
> kernel 5.19.8, it works fine for me, and no obvious issues.
> 
> I also tried in on kernel 6.0, again works fine and no obvious issues.
> 
> (In reply to damien.lemoal from comment #39)
> > I am not sure at all this is correct though. This actually may break other
> > suspend/resume flavors. If we could somehow synchronize scsi pm resume to
> > run *after* ata pm resume, all problems should go away I think.
> 
> With regard to Damiens comments, and the problems with this patch last time
> it was submitted, I think it would be a good idea to have more people
> testing this patch before re-submitting it.

I did not submit that patch on the lists, because I am not convinced this is
the right approach. It is a "hack" right now. As mentioned, the problem is that
scsi and ata pm resume are running at the same time because the dev/pm code
does not seem to know the dependency between the devices (struct dev). Would
need to dig further into that first to see if a cleaner solution can be coded.
Will try, but busy, so it may take some time. I first need to be able to
recreate the issue on my systems. Will start with that :)

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