HID: core: store the unique system identifier in hid_device
[ Upstream commit 1e839143 ] This unique identifier is currently used only for ensuring uniqueness in sysfs. However, this could be handful for userspace to refer to a specific hid_device by this id. 2 use cases are in my mind: LEDs (and their naming convention), and HID-BPF. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Link: https://lore.kernel.org/r/20220902132938.2409206-9-benjamin.tissoires@redhat.com Stable-dep-of: fc43e9c8 ("HID: fix HID device resource race between HID core and debugging support") Signed-off-by: Sasha Levin <sashal@kernel.org>
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