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Add tests for gpiolib-cdev to make sure accessing to dangling resources via the opening file descriptor won't crash the system after the underlying resource providers have gone. Reviewed-by: Linus Walleij <linusw@kernel.org> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Link: https://patch.msgid.link/20260223061726.82161-7-tzungbi@kernel.org Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>