PCI/proc: Warn on writes to kernel-exclusive config space regions

Currently, a driver can claim a region of a device's config space as
exclusive using pci_request_config_region_exclusive(), after which a write
to that region originating from user space is expected to emit a warning
and taint the kernel.  The check is advisory only, as the write itself is
still allowed to proceed.

Since commit 278294798ac9 ("PCI: Allow drivers to request exclusive config
regions"), the sysfs config space attribute performs this check in
pci_write_config(), but the procfs interface was never updated.  A write
performed through /proc/bus/pci/BB/DD.F therefore bypasses the detection
entirely, even though both interfaces offer the same level of access.

Add the same resource_is_exclusive() check to proc_bus_pci_write().

Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260729075413.1215821-1-kwilczynski@kernel.org

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