linux-kernel - [PATCH] net: sky2: initialize return of gm_phy

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Message-Id: <20200703133359.22723-1-trix@redhat.com>
Date:   Fri,  3 Jul 2020 06:33:59 -0700
From:   trix@...hat.com
To:     mlindner@...vell.com, stephen@...workplumber.org,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] net: sky2: initialize return of gm_phy_read

From: Tom Rix <trix@...hat.com>

clang static analysis flags this garbage return

drivers/net/ethernet/marvell/sky2.c:208:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn]
        return v;
        ^~~~~~~~

static inline u16 gm_phy_read( ...
{
	u16 v;
	__gm_phy_read(hw, port, reg, &v);
	return v;
}

__gm_phy_read can return without setting v.

So handle similar to skge.c's gm_phy_read, initialize v.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/net/ethernet/marvell/sky2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index 241f00716979..fe54764caea9 100644
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -203,7 +203,7 @@ static int __gm_phy_read(struct sky2_hw *hw, unsigned port, u16 reg, u16 *val)
 
 static inline u16 gm_phy_read(struct sky2_hw *hw, unsigned port, u16 reg)
 {
-	u16 v;
+	u16 v = 0;
 	__gm_phy_read(hw, port, reg, &v);
 	return v;
 }
-- 
2.18.1