Re: [PATCH v2 0/2] perf/dwc_pcie: Fix lockdep warnings in device and event setup

[Will Deacon]

On Tue, Aug 11, 2026 at 09:17:12PM +0800, Zhanpeng Zhang wrote:
> The DWC PCIe PMU driver creates a synthetic platform device for each Root
> Port from its PCI bus notifier. If a PCI host bridge is registered during
> late init, platform device registration enters the platform bus notifier
> chain while the PCI bus notifier lock remains held, and lockdep reports
> possible recursive locking. Patch 1 moves platform device reconciliation
> out of the notifier callback.
> 
> The event initialization path has a separate locking issue. It walks a new
> group leader's sibling list even though perf does not hold the event context
> lock required by for_each_sibling_event(). Patch 2 skips those walks for
> group leaders while preserving validation for group members.
> 
> The series was tested on a RISC-V system with CONFIG_KASAN,
> CONFIG_PROVE_LOCKING, CONFIG_DEBUG_LOCK_ALLOC and CONFIG_LOCKDEP enabled.
> Late PCI discovery and a system-wide DWC PCIe PMU perf stat complete without
> lockdep reports, and the kernel remains untainted.
> 
> Zhanpeng Zhang (2):
>   perf/dwc_pcie: Avoid nested bus notifier locking
>   perf/dwc_pcie: Skip sibling walks for new group leaders
> 
>  drivers/perf/dwc_pcie_pmu.c | 161 +++++++++++++++++++++++++++---------
>  1 file changed, 122 insertions(+), 39 deletions(-)

This doesn't seem to apply. Please can you send an updated version?

Will