Re: [RFT PATCH v3 1/1] usb: hub: Fix flushing of delayed work used for post resume purposes

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 6/27/25 6:43 PM, Mathias Nyman wrote:
> Delayed work that prevents USB3 hubs from runtime-suspending too early
> needed to be flushed in hub_quiesce() to resolve issues detected on
> QC SC8280XP CRD board during suspend resume testing.
> 
> This flushing did however trigger new issues on Raspberry Pi 3B+, which
> doesn't have USB3 ports, and doesn't queue any post resume delayed work.
> 
> The flushed 'hub->init_work' item is used for several purposes, and
> is originally initialized with a 'NULL' work function. The work function
> is also changed on the fly, which may contribute to the issue.
> 
> Solve this by creating a dedicated delayed work item for post resume work,
> and flush that delayed work in hub_quiesce()
> 
> Cc: stable@kernel.org
> Fixes: a49e1e2e785f ("usb: hub: Fix flushing and scheduling of delayed work that tunes runtime pm")
> Reported-by: Mark Brown <broonie@kernel.org>
> Closes: https://lore.kernel.org/linux-usb/aF5rNp1l0LWITnEB@finisterre.sirena.org.uk
> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> ---

Still no issues, thanks for working on this!

Tested-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com> # SC8280XP CRD

Konrad