linux-kernel - [PATCH] NFC: trf7970a: fix check of clock frequencies, use && instead of ||

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Date:   Mon, 24 Apr 2017 14:36:02 +0100
From:   Colin King <colin.king@...onical.com>
To:     Geoff Lansberry <geoff@...ee.com>,
        Samuel Ortiz <sameo@...ux.intel.com>,
        linux-wireless@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] NFC: trf7970a: fix check of clock frequencies, use && instead of ||

From: Colin Ian King <colin.king@...onical.com>

The "or" condition (clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) ||
(clk_freq != TRF7970A_13MHZ_CLOCK_FREQUE) will always be true because
clk_freq cannot be equal to two different values at the same time. Use
the  && operator instead of || to fix this.

Detected by CoverityScan, CID#1430468 ("Constant expression result")

Fixes: 837eb4d21ecde7 ("NFC: trf7970a: add device tree option for 27MHz clock")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/nfc/trf7970a.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 2d1c8ca6e679..00eb6cd2b22f 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -2071,8 +2071,8 @@ static int trf7970a_probe(struct spi_device *spi)
 	}
 
 	of_property_read_u32(np, "clock-frequency", &clk_freq);
-	if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) ||
-		(clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) {
+	if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) &&
+		(clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) {
 		dev_err(trf->dev,
 			"clock-frequency (%u Hz) unsupported\n",
 			clk_freq);
-- 
2.11.0