linux-kernel - [PATCH 4.9 003/271] mt7601u: fix bbp version check in mt7601u_wait_bbp

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Date:   Tue, 28 Jan 2020 15:02:32 +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, Jakub Kicinski <kubakici@...pl>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.9 003/271] mt7601u: fix bbp version check in mt7601u_wait_bbp_ready

From: Lorenzo Bianconi <lorenzo@...nel.org>

commit 15e14f76f85f4f0eab3b8146e1cd3c58ce272823 upstream.

Fix bbp ready check in mt7601u_wait_bbp_ready. The issue is reported by
coverity with the following error:

Logical vs. bitwise operator
The expression's value does not depend on the operands; inadvertent use
of the wrong operator is a likely logic error.

Addresses-Coverity-ID: 1309441 ("Logical vs. bitwise operator")
Fixes: c869f77d6abb ("add mt7601u driver")
Acked-by: Jakub Kicinski <kubakici@...pl>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/mediatek/mt7601u/phy.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/mediatek/mt7601u/phy.c
+++ b/drivers/net/wireless/mediatek/mt7601u/phy.c
@@ -221,7 +221,7 @@ int mt7601u_wait_bbp_ready(struct mt7601

 	do {
 		val = mt7601u_bbp_rr(dev, MT_BBP_REG_VERSION);
-		if (val && ~val)
+		if (val && val != 0xff)
 			break;
 	} while (--i);