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i2c: Fix deselection of muxes 

Due to an uninitialised variable, when muxes were deselected, any value
could be written to the mux control register. On the PCA9548, this could
result in multiple channels being selected, thus enabling multiple
pull-up resistors, and much bus capacitance.

The fix is simply to initialise the written value to zero.

Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
This commit is contained in:
Mark Tomlinson 2014-12-02 08:49:18 +13:00 committed by Heiko Schocher
parent 97cdf64026
commit 2fe50ef403
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/i2c_core.c
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@ -178,7 +178,7 @@ static int i2c_mux_disconnet_all(void)
{ {
struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS]; struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS];
int i; int i;
uint8_t buf; uint8_t buf = 0;
if (I2C_ADAP->init_done == 0) if (I2C_ADAP->init_done == 0)
return 0; return 0;