From 2d5d23b96a4a660d0d04455150570c6257d4ce25 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Mon, 30 Nov 2015 18:53:34 +0900 Subject: [PATCH] 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 Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-uniphier.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/i2c/busses/i2c-uniphier.c b/drivers/i2c/busses/i2c-uniphier.c index 2b2c20b..1f4f3f5 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; -- 2.7.4