From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Mon, 30 Nov 2015 09:53:34 +0000 (+0900)
Subject: i2c: uniphier: error out if bus speed is zero
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2d5d23b96a4a660d0d04455150570c6257d4ce25;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

i2c: uniphier: error out if bus speed is zero

There is code to divide by "bus_speed" some lines below.
To eliminate the possibility of division by zero, bail out if
"clock-frequency" is specified as zero.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---

diff --git a/drivers/i2c/busses/i2c-uniphier.c b/drivers/i2c/busses/i2c-uniphier.c
index 2b2c20b3a57a..1f4f3f53819c 100644
--- a/drivers/i2c/busses/i2c-uniphier.c
+++ b/drivers/i2c/busses/i2c-uniphier.c
@@ -327,6 +327,11 @@ static int uniphier_i2c_clk_init(struct device *dev,
 	if (of_property_read_u32(np, "clock-frequency", &bus_speed))
 		bus_speed = UNIPHIER_I2C_DEFAULT_SPEED;
 
+	if (!bus_speed) {
+		dev_err(dev, "clock-freqyency should not be zero\n");
+		return -EINVAL;
+	}
+
 	if (bus_speed > UNIPHIER_I2C_MAX_SPEED)
 		bus_speed = UNIPHIER_I2C_MAX_SPEED;