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Subject[14/27] i2c: Fix error value returned by several bus drivers
2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Jean Delvare <khali@linux-fr.org>

commit 7c1f59c9d5caf3a84f35549b5d58f3c055a68da5 upstream.

When adding checks for ACPI resource conflicts to many bus drivers,
not enough attention was paid to the error paths, and for several
drivers this causes 0 to be returned on error in some cases. Fix this
by properly returning a non-zero value on every error.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/i2c/busses/i2c-ali1535.c | 11 +++++++----
drivers/i2c/busses/i2c-nforce2.c | 2 +-
drivers/i2c/busses/i2c-sis5595.c | 4 ++--
drivers/i2c/busses/i2c-sis630.c | 6 +++++-
drivers/i2c/busses/i2c-viapro.c | 7 +++++--
5 files changed, 20 insertions(+), 10 deletions(-)

--- a/drivers/i2c/busses/i2c-ali1535.c
+++ b/drivers/i2c/busses/i2c-ali1535.c
@@ -140,7 +140,7 @@ static unsigned short ali1535_smba;
defined to make the transition easier. */
static int ali1535_setup(struct pci_dev *dev)
{
- int retval = -ENODEV;
+ int retval;
unsigned char temp;

/* Check the following things:
@@ -155,6 +155,7 @@ static int ali1535_setup(struct pci_dev
if (ali1535_smba == 0) {
dev_warn(&dev->dev,
"ALI1535_smb region uninitialized - upgrade BIOS?\n");
+ retval = -ENODEV;
goto exit;
}

@@ -167,6 +168,7 @@ static int ali1535_setup(struct pci_dev
ali1535_driver.name)) {
dev_err(&dev->dev, "ALI1535_smb region 0x%x already in use!\n",
ali1535_smba);
+ retval = -EBUSY;
goto exit;
}

@@ -174,6 +176,7 @@ static int ali1535_setup(struct pci_dev
pci_read_config_byte(dev, SMBCFG, &temp);
if ((temp & ALI1535_SMBIO_EN) == 0) {
dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n");
+ retval = -ENODEV;
goto exit_free;
}

@@ -181,6 +184,7 @@ static int ali1535_setup(struct pci_dev
pci_read_config_byte(dev, SMBHSTCFG, &temp);
if ((temp & 1) == 0) {
dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n");
+ retval = -ENODEV;
goto exit_free;
}

@@ -198,12 +202,11 @@ static int ali1535_setup(struct pci_dev
dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
dev_dbg(&dev->dev, "ALI1535_smba = 0x%X\n", ali1535_smba);

- retval = 0;
-exit:
- return retval;
+ return 0;

exit_free:
release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
+exit:
return retval;
}

--- a/drivers/i2c/busses/i2c-nforce2.c
+++ b/drivers/i2c/busses/i2c-nforce2.c
@@ -355,7 +355,7 @@ static int __devinit nforce2_probe_smb (
error = acpi_check_region(smbus->base, smbus->size,
nforce2_driver.name);
if (error)
- return -1;
+ return error;

if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
--- a/drivers/i2c/busses/i2c-sis5595.c
+++ b/drivers/i2c/busses/i2c-sis5595.c
@@ -147,7 +147,7 @@ static int sis5595_setup(struct pci_dev
u16 a;
u8 val;
int *i;
- int retval = -ENODEV;
+ int retval;

/* Look for imposters */
for (i = blacklist; *i != 0; i++) {
@@ -223,7 +223,7 @@ static int sis5595_setup(struct pci_dev

error:
release_region(sis5595_base + SMB_INDEX, 2);
- return retval;
+ return -ENODEV;
}

static int sis5595_transaction(struct i2c_adapter *adap)
--- a/drivers/i2c/busses/i2c-sis630.c
+++ b/drivers/i2c/busses/i2c-sis630.c
@@ -393,7 +393,7 @@ static int sis630_setup(struct pci_dev *
{
unsigned char b;
struct pci_dev *dummy = NULL;
- int retval = -ENODEV, i;
+ int retval, i;

/* check for supported SiS devices */
for (i=0; supported[i] > 0 ; i++) {
@@ -418,18 +418,21 @@ static int sis630_setup(struct pci_dev *
*/
if (pci_read_config_byte(sis630_dev, SIS630_BIOS_CTL_REG,&b)) {
dev_err(&sis630_dev->dev, "Error: Can't read bios ctl reg\n");
+ retval = -ENODEV;
goto exit;
}
/* if ACPI already enabled , do nothing */
if (!(b & 0x80) &&
pci_write_config_byte(sis630_dev, SIS630_BIOS_CTL_REG, b | 0x80)) {
dev_err(&sis630_dev->dev, "Error: Can't enable ACPI\n");
+ retval = -ENODEV;
goto exit;
}

/* Determine the ACPI base address */
if (pci_read_config_word(sis630_dev,SIS630_ACPI_BASE_REG,&acpi_base)) {
dev_err(&sis630_dev->dev, "Error: Can't determine ACPI base address\n");
+ retval = -ENODEV;
goto exit;
}

@@ -445,6 +448,7 @@ static int sis630_setup(struct pci_dev *
sis630_driver.name)) {
dev_err(&sis630_dev->dev, "SMBus registers 0x%04x-0x%04x already "
"in use!\n", acpi_base + SMB_STS, acpi_base + SMB_SAA);
+ retval = -EBUSY;
goto exit;
}

--- a/drivers/i2c/busses/i2c-viapro.c
+++ b/drivers/i2c/busses/i2c-viapro.c
@@ -330,7 +330,7 @@ static int __devinit vt596_probe(struct
const struct pci_device_id *id)
{
unsigned char temp;
- int error = -ENODEV;
+ int error;

/* Determine the address of the SMBus areas */
if (force_addr) {
@@ -396,6 +396,7 @@ found:
dev_err(&pdev->dev, "SMBUS: Error: Host SMBus "
"controller not enabled! - upgrade BIOS or "
"use force=1\n");
+ error = -ENODEV;
goto release_region;
}
}
@@ -428,9 +429,11 @@ found:
"SMBus Via Pro adapter at %04x", vt596_smba);

vt596_pdev = pci_dev_get(pdev);
- if (i2c_add_adapter(&vt596_adapter)) {
+ error = i2c_add_adapter(&vt596_adapter);
+ if (error) {
pci_dev_put(vt596_pdev);
vt596_pdev = NULL;
+ goto release_region;
}

/* Always return failure here. This is to allow other drivers to bind



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