From 399d6b26539d83dd734746dc2292d53fbc5807b2 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sun, 10 Aug 2008 22:56:15 +0200 Subject: [PATCH] i2c: Fix oops on bus multiplexer driver loading The two I2C bus multiplexer drivers (i2c-amd756-s4882 and i2c-nforce2-s4985) make use of the bus they want to multiplex before checking if it is really present. Swap the instructions to test for presence first. This fixes a oops reported by Ingo Molnar. Signed-off-by: Jean Delvare Cc: Ingo Molnar --- drivers/i2c/busses/i2c-amd756-s4882.c | 9 ++++----- drivers/i2c/busses/i2c-nforce2-s4985.c | 5 +++-- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-amd756-s4882.c b/drivers/i2c/busses/i2c-amd756-s4882.c index 72872d1e63..8ba2bcf727 100644 --- a/drivers/i2c/busses/i2c-amd756-s4882.c +++ b/drivers/i2c/busses/i2c-amd756-s4882.c @@ -155,6 +155,9 @@ static int __init amd756_s4882_init(void) int i, error; union i2c_smbus_data ioconfig; + if (!amd756_smbus.dev.parent) + return -ENODEV; + /* Configure the PCA9556 multiplexer */ ioconfig.byte = 0x00; /* All I/O to output mode */ error = i2c_smbus_xfer(&amd756_smbus, 0x18, 0, I2C_SMBUS_WRITE, 0x03, @@ -168,11 +171,7 @@ static int __init amd756_s4882_init(void) /* Unregister physical bus */ error = i2c_del_adapter(&amd756_smbus); if (error) { - if (error == -EINVAL) - error = -ENODEV; - else - dev_err(&amd756_smbus.dev, "Physical bus removal " - "failed\n"); + dev_err(&amd756_smbus.dev, "Physical bus removal failed\n"); goto ERROR0; } diff --git a/drivers/i2c/busses/i2c-nforce2-s4985.c b/drivers/i2c/busses/i2c-nforce2-s4985.c index d1a4cbcf2a..29015eb9ca 100644 --- a/drivers/i2c/busses/i2c-nforce2-s4985.c +++ b/drivers/i2c/busses/i2c-nforce2-s4985.c @@ -150,6 +150,9 @@ static int __init nforce2_s4985_init(void) int i, error; union i2c_smbus_data ioconfig; + if (!nforce2_smbus) + return -ENODEV; + /* Configure the PCA9556 multiplexer */ ioconfig.byte = 0x00; /* All I/O to output mode */ error = i2c_smbus_xfer(nforce2_smbus, 0x18, 0, I2C_SMBUS_WRITE, 0x03, @@ -161,8 +164,6 @@ static int __init nforce2_s4985_init(void) } /* Unregister physical bus */ - if (!nforce2_smbus) - return -ENODEV; error = i2c_del_adapter(nforce2_smbus); if (error) { dev_err(&nforce2_smbus->dev, "Physical bus removal failed\n"); -- 2.39.5