[PATCH] pcp_clock: return EOPNOTSUPP if !CONFIG_PTP_1588_CLOCK

[Wang Qing]

pcp_clock_register() is checked with IS_ERR(), and will crash if !PTP,
change return value to ERR_PTR(-EOPNOTSUPP) for the !CONFIG_PTP_1588_CLOCK
 and so question resolved.

Signed-off-by: Wang Qing <wangqing@xxxxxxxx>
---
 include/linux/ptp_clock_kernel.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index d3e8ba5..05db40c
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -276,7 +276,7 @@ void ptp_cancel_worker_sync(struct ptp_clock *ptp);
 #else
 static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
 						   struct device *parent)
-{ return NULL; }
+{ return ERR_PTR(-EOPNOTSUPP); }
 static inline int ptp_clock_unregister(struct ptp_clock *ptp)
 { return 0; }
 static inline void ptp_clock_event(struct ptp_clock *ptp,
-- 
2.7.4