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i2c: uniphier_f: error out if bus speed is zero

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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>
This commit is contained in:
Masahiro Yamada 2015-11-30 18:53:36 +09:00 committed by Wolfram Sang
parent ac9b91f39d
commit 51549c087f
1 changed files with 5 additions and 0 deletions
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5
drivers/i2c/busses/i2c-uniphier-f.c
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@ -466,6 +466,11 @@ static int uniphier_fi2c_clk_init(struct device *dev,
if (of_property_read_u32(np, "clock-frequency", &bus_speed))
bus_speed = UNIPHIER_FI2C_DEFAULT_SPEED;
if (!bus_speed) {
dev_err(dev, "clock-freqyency should not be zero\n");
return -EINVAL;
}
if (bus_speed > UNIPHIER_FI2C_MAX_SPEED)
bus_speed = UNIPHIER_FI2C_MAX_SPEED;