[PATCH] net: cpts: Condition WARN_ON on PTP_1588_CLOCK

[Clay McClure]

CPTS_MOD merely implies PTP_1588_CLOCK; it is possible to build cpts
without PTP clock support. In that case, ptp_clock_register() returns
NULL and we should not WARN_ON(cpts->clock) when downing the interface.
The ptp_*() functions are stubbed without PTP_1588_CLOCK, so it's safe
to pass them a null pointer.

Signed-off-by: Clay McClure <clay@xxxxxxxxxxx>
---
 drivers/net/ethernet/ti/cpts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index fd214f8730a9..daf4505f4a70 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -646,7 +646,7 @@ EXPORT_SYMBOL_GPL(cpts_register);
 
 void cpts_unregister(struct cpts *cpts)
 {
-	if (WARN_ON(!cpts->clock))
+	if (IS_REACHABLE(PTP_1588_CLOCK) && WARN_ON(!cpts->clock))
 		return;
 
 	ptp_clock_unregister(cpts->clock);
-- 
2.20.1