diff options
| author |   Jean Delvare <jdelvare@suse.de> | 2016-01-25 12:17:07 +0100 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2016-01-26 06:46:33 +0100 |
| commit | 83c60158ebf16417af28b338bc0380cf17f2b9f9 (patch) | |
| tree | b423fce0514240f58a7aae94ee0b7b7287ac4b36 /drivers/i2c | |
| parent | i2c: piix4: Fix SB800 locking (diff) | |
| download | linux-dev-83c60158ebf16417af28b338bc0380cf17f2b9f9.tar.xz linux-dev-83c60158ebf16417af28b338bc0380cf17f2b9f9.zip | |
i2c: piix4: Fully initialize SB800 before it is registered
This closes a race window where I2C device drivers attempt to access
I2C buses which aren't fully initialized yet.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Christian Fetzer <fetzer.ch@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 5fd7505b9018..f79a84ef1aa4 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -627,6 +627,7 @@ static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS]; static struct i2c_adapter *piix4_aux_adapter; static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, + bool sb800_main, unsigned short port, const char *name, struct i2c_adapter **padap) { struct i2c_adapter *adap; @@ -641,7 +642,8 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, adap->owner = THIS_MODULE; adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; - adap->algo = &smbus_algorithm; + adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800 + : &smbus_algorithm; adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL); if (adapdata == NULL) { @@ -651,6 +653,8 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, } adapdata->smba = smba; + adapdata->sb800_main = sb800_main; + adapdata->port = port; /* set up the sysfs linkage to our parent device */ adap->dev.parent = &dev->dev; @@ -680,17 +684,11 @@ static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba) int retval; for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) { - retval = piix4_add_adapter(dev, smba, + retval = piix4_add_adapter(dev, smba, true, port, piix4_main_port_names_sb800[port], &piix4_main_adapters[port]); if (retval < 0) goto error; - - piix4_main_adapters[port]->algo = &piix4_smbus_algorithm_sb800; - - adapdata = i2c_get_adapdata(piix4_main_adapters[port]); - adapdata->sb800_main = true; - adapdata->port = port; } return retval; @@ -748,7 +746,7 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id) return retval; /* Try to register main SMBus adapter, give up if we can't */ - retval = piix4_add_adapter(dev, retval, "main", + retval = piix4_add_adapter(dev, retval, false, 0, "main", &piix4_main_adapters[0]); if (retval < 0) return retval; @@ -775,7 +773,8 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id) if (retval > 0) { /* Try to add the aux adapter if it exists, * piix4_add_adapter will clean up if this fails */ - piix4_add_adapter(dev, retval, piix4_aux_port_name_sb800, + piix4_add_adapter(dev, retval, false, 0, + piix4_aux_port_name_sb800, &piix4_aux_adapter); } |