From 2fe50ef4034b69b45413108dd3e736de2548c04a Mon Sep 17 00:00:00 2001
From: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
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 <mark.tomlinson@alliedtelesis.co.nz>
---
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;
--
2.39.5