linux-kernel - [PATCH] spi: stm32: Fix logical error in stm32_spi_prepare

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Date:   Sun, 10 Sep 2017 14:55:29 +0100
From:   Christos Gkekas <chris.gekas@...il.com>
To:     Amelie Delaunay <amelie.delaunay@...com>,
        Mark Brown <broonie@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Christos Gkekas <chris.gekas@...il.com>
Subject: [PATCH] spi: stm32: Fix logical error in stm32_spi_prepare_mbr()

stm32_spi_prepare_mbr() is returning an error value when div is less
than SPI_MBR_DIV_MIN *and* greater than SPI_MBR_DIV_MAX, which always
evaluates to false. This should change to use *or*.

Signed-off-by: Christos Gkekas <chris.gekas@...il.com>
---
 drivers/spi/spi-stm32.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 680cdf5..ba9743f 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -263,8 +263,8 @@ static int stm32_spi_prepare_mbr(struct stm32_spi *spi, u32 speed_hz)
 	 * no need to check it there.
 	 * However, we need to ensure the following calculations.
 	 */
-	if ((div < SPI_MBR_DIV_MIN) &&
-	    (div > SPI_MBR_DIV_MAX))
+	if (div < SPI_MBR_DIV_MIN ||
+	    div > SPI_MBR_DIV_MAX)
 		return -EINVAL;
 
 	/* Determine the first power of 2 greater than or equal to div */
-- 
2.7.4