[PATCH v3 1/2] driver core: Add conditional guard support for device_trylock()

[Guixin Liu <kanie@linux.alibaba.com>]

Introduce a conditional guard version of device_trylock() for scenarios
that must not block on the device lock. device_trylock() returns 1 on
success like mutex_trylock(), so the default binary condition applies and
ACQUIRE_ERR() reports -EBUSY on contention.

Suggested-by: Shaikh Kamaluddin <shaikhkamal2012@gmail.com>
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
---
 include/linux/device.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index aee79fd6b32b..a8d6cf76d137 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1121,6 +1121,7 @@ static inline void device_unlock(struct device *dev)
 
 DEFINE_GUARD(device, struct device *, device_lock(_T), device_unlock(_T))
 DEFINE_GUARD_COND(device, _intr, device_lock_interruptible(_T), _RET == 0)
+DEFINE_GUARD_COND(device, _try, device_trylock(_T))
 
 static inline void device_lock_assert(struct device *dev)
 {
-- 
2.43.7