brightness_mutex 6652 drivers/platform/x86/thinkpad_acpi.c static struct mutex brightness_mutex; brightness_mutex 6679 drivers/platform/x86/thinkpad_acpi.c if (mutex_lock_killable(&brightness_mutex) < 0) brightness_mutex 6703 drivers/platform/x86/thinkpad_acpi.c mutex_unlock(&brightness_mutex); brightness_mutex 6778 drivers/platform/x86/thinkpad_acpi.c res = mutex_lock_killable(&brightness_mutex); brightness_mutex 6794 drivers/platform/x86/thinkpad_acpi.c mutex_unlock(&brightness_mutex); brightness_mutex 6820 drivers/platform/x86/thinkpad_acpi.c res = mutex_lock_killable(&brightness_mutex); brightness_mutex 6826 drivers/platform/x86/thinkpad_acpi.c mutex_unlock(&brightness_mutex); brightness_mutex 6975 drivers/platform/x86/thinkpad_acpi.c mutex_init(&brightness_mutex);