Re: [PATCH v4] PCI/proc: Fix race between pci_proc_init() and pci_bus_add_device()

["Krzysztof Wilczyński" <kwilczynski@kernel.org>]

Hello,

[...]
> Thus, serialise access to proc_initialized, proc_bus_pci_dir,
> bus->procdir and dev->procent with a new mutex local to the
> drivers/pci/proc.c file, and store the created entries to
> bus->procdir and dev->procent only on success, so a failed
> creation can never overwrite a valid pointer.
> 
> Additionally, wrap the for_each_pci_dev() loop in pci_proc_init() with
> pci_lock_rescan_remove() to serialise against concurrent PCI bus
> operations, add an early return in pci_proc_attach_device() when
> dev->procent is already set to make the function idempotent, and clear
> bus->procdir in pci_proc_detach_bus() to prevent use of a dangling
> pointer after proc_remove().
> 
> Reported-by: Shuan He <heshuan@bytedance.com>
> Closes: https://lore.kernel.org/linux-pci/20250702155112.40124-2-heshuan@bytedance.com/

Applied to procfs branch.

Thank you,

	Krzysztof