[Bug 222071] [Bisected] [Regression] xhci_hcd: Resuming from hibernation fails with "Not enough host resources"

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=222071

--- Comment #9 from Michał Pecio (michal.pecio@gmail.com) ---
On Wed, 30 Sep 2026 06:45:29 +0000, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=222071
> 
> --- Comment #8 from Harald Judt (h.judt@gmx.at) ---
> Is there some quirk that makes these controllers reset themselves
> like they did before that commit? Reverting the patch helps now, but
> is not very future-proof.

The problem is not with HW but with SW - "optimize resuming from S4"
broke bandwidth calculations which the driver performs for old HW that
cannot do them itself. That's why new HW works without issues.

The driver obviously needs to be fixed, maybe Lovekesh will find the
remaining issues (already found one), or if not, I am alerting the
original culprits right now.

IMHO reverting this in mainline would be fine too - the "optimization"
is negligible while it costs bugs and copy-pasted code.

Regards,
Michal

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