linux-kernel - [PATCH] net: cpts: Condition WARN_ON on PTP_1588

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Message-Id: <20200416085627.1882-1-clay@daemons.net>
Date:   Thu, 16 Apr 2020 01:56:26 -0700
From:   Clay McClure <clay@...mons.net>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Clay McClure <clay@...mons.net>,
        "David S. Miller" <davem@...emloft.net>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Sekhar Nori <nsekhar@...com>,
        Richard Cochran <richardcochran@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: cpts: Condition WARN_ON on PTP_1588_CLOCK

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@...mons.net>
---
 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