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authorMasahiro Yamada <yamada.masahiro@socionext.com>2015-11-30 12:53:34 +0300
committerWolfram Sang <wsa@the-dreams.de>2015-12-14 12:59:05 +0300
commit2d5d23b96a4a660d0d04455150570c6257d4ce25 (patch)
treeb5b2517431452c05dd47f5be026f9ce030ce41bf /drivers/i2c
parent1ff49b34bfd1261277d2c97ec48efb067b87f5e5 (diff)
downloadlinux-2d5d23b96a4a660d0d04455150570c6257d4ce25.tar.xz
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-uniphier.c5
1 files changed, 5 insertions, 0 deletions
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;