From 2fe50ef4034b69b45413108dd3e736de2548c04a Mon Sep 17 00:00:00 2001 From: Mark Tomlinson Date: Tue, 2 Dec 2014 08:49:18 +1300 Subject: [PATCH] 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 --- drivers/i2c/i2c_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/i2c_core.c b/drivers/i2c/i2c_core.c index d34b749a56..4539667eae 100644 --- a/drivers/i2c/i2c_core.c +++ b/drivers/i2c/i2c_core.c @@ -178,7 +178,7 @@ static int i2c_mux_disconnet_all(void) { struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS]; int i; - uint8_t buf; + uint8_t buf = 0; if (I2C_ADAP->init_done == 0) return 0; -- 2.30.2