linux-kernel - [PATCH] net: dsa: b53: check for timeout

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Message-Id: <20200821135600.18017-1-trix@redhat.com>
Date:   Fri, 21 Aug 2020 06:56:00 -0700
From:   trix@...hat.com
To:     f.fainelli@...il.com, andrew@...n.ch, vivien.didelot@...il.com,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] net: dsa: b53: check for timeout

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

clang static analysis reports this problem

b53_common.c:1583:13: warning: The left expression of the compound
  assignment is an uninitialized value. The computed value will
  also be garbage
        ent.port &= ~BIT(port);
        ~~~~~~~~ ^

ent is set by a successful call to b53_arl_read().  Unsuccessful
calls are caught by an switch statement handling specific returns.
b32_arl_read() calls b53_arl_op_wait() which fails with the
unhandled -ETIMEDOUT.

So add -ETIMEDOUT to the switch statement.  Because
b53_arl_op_wait() already prints out a message, do not add another
one.

Fixes: 1da6df85c6fb ("net: dsa: b53: Implement ARL add/del/dump operations")

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/net/dsa/b53/b53_common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index abe0a3e20648..e731db900ee0 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1554,6 +1554,8 @@ static int b53_arl_op(struct b53_device *dev, int op, int port,
 		return ret;
 
 	switch (ret) {
+	case -ETIMEDOUT:
+		return ret;
 	case -ENOSPC:
 		dev_dbg(dev->dev, "{%pM,%.4d} no space left in ARL\n",
 			addr, vid);
-- 
2.18.1