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devm_mutex_init() can fail. With CONFIG_DEBUG_MUTEXES=y the mutex will be marked as unusable and trigger errors on usage. Enforce all callers check the return value through the compiler. As devm_mutex_init() itself is a macro, it can not be annotated directly. Annotate __devm_mutex_init() instead. Unfortunately __must_check/warn_unused_result don't propagate through statement expression. So move the statement expression into the argument list of the call to __devm_mutex_init() through a helper macro. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/20250617-must_check-devm_mutex_init-v7-3-d9e449f4d224@weissschuh.net