linux-kernel - [PATCH] Bluetooth: Simplify / fix return values from tk

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Message-Id: <20200403150236.74232-1-linux@roeck-us.net>
Date:   Fri,  3 Apr 2020 08:02:36 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Sonny Sasaka <sonnysasaka@...omium.org>
Subject: [PATCH] Bluetooth: Simplify / fix return values from tk_request

Some static checker run by 0day reports a variableScope warning.

net/bluetooth/smp.c:870:6: warning:
	The scope of the variable 'err' can be reduced. [variableScope]

There is no need for two separate variables holding return values.
Stick with the existing variable. While at it, don't pre-initialize
'ret' because it is set in each code path.

tk_request() is supposed to return a negative error code on errors,
not a bluetooth return code. The calling code converts the return
value to SMP_UNSPECIFIED if needed.

Fixes: 92516cd97fd4 ("Bluetooth: Always request for user confirmation for Just Works")
Cc: Sonny Sasaka <sonnysasaka@...omium.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 net/bluetooth/smp.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index d0b695ee49f6..30e8626dd553 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -854,8 +854,7 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
 	struct l2cap_chan *chan = conn->smp;
 	struct smp_chan *smp = chan->data;
 	u32 passkey = 0;
-	int ret = 0;
-	int err;
+	int ret;
 
 	/* Initialize key for JUST WORKS */
 	memset(smp->tk, 0, sizeof(smp->tk));
@@ -887,12 +886,12 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
 	/* If Just Works, Continue with Zero TK and ask user-space for
 	 * confirmation */
 	if (smp->method == JUST_WORKS) {
-		err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
+		ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
 						hcon->type,
 						hcon->dst_type,
 						passkey, 1);
-		if (err)
-			return SMP_UNSPECIFIED;
+		if (ret)
+			return ret;
 		set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
 		return 0;
 	}
-- 
2.17.1