linux-kernel - [PATCH 4.14 090/143] net: phy: phylink: Dont release NULL GPIO

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Date:   Fri,  2 Nov 2018 19:34:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 090/143] net: phy: phylink: Dont release NULL GPIO

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 3bcd47726c3b744fd08781795cca905cc59a1382 ]

If CONFIG_GPIOLIB is disabled, gpiod_put() becomes a stub that produces a
warning, this helped identify that we could be attempting to release a NULL
pl->link_gpio GPIO descriptor, so guard against that.

Fixes: daab3349ad1a ("net: phy: phylink: Release link GPIO")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/phy/phylink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index e4a6ed88b9cf..79f28b9186c6 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -561,7 +561,7 @@ void phylink_destroy(struct phylink *pl)
 {
 	if (pl->sfp_bus)
 		sfp_unregister_upstream(pl->sfp_bus);
-	if (!IS_ERR(pl->link_gpio))
+	if (!IS_ERR_OR_NULL(pl->link_gpio))
 		gpiod_put(pl->link_gpio);
 
 	cancel_work_sync(&pl->resolve);
-- 
2.17.1