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i2c-for-7.0-rc3

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A revert for the i801 driver restoring old locking behaviour.
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Merge tag 'i2c-for-7.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fix from Wolfram Sang:
 "A revert for the i801 driver restoring old locking behaviour"

* tag 'i2c-for-7.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: i801: Revert "i2c: i801: replace acpi_lock with I2C bus lock"
This commit is contained in:
Linus Torvalds 2026-03-08 10:17:05 -07:00
commit 014441d1e4
1 changed files with 10 additions and 4 deletions
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14
drivers/i2c/busses/i2c-i801.c
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@ -310,9 +310,10 @@ struct i801_priv {
/*
* If set to true the host controller registers are reserved for
* ACPI AML use.
* ACPI AML use. Needs extra protection by acpi_lock.
*/
bool acpi_reserved;
struct mutex acpi_lock;
};
#define FEATURE_SMBUS_PEC BIT(0)
@ -894,8 +895,11 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
int hwpec, ret;
struct i801_priv *priv = i2c_get_adapdata(adap);
if (priv->acpi_reserved)
mutex_lock(&priv->acpi_lock);
if (priv->acpi_reserved) {
mutex_unlock(&priv->acpi_lock);
return -EBUSY;
}
pm_runtime_get_sync(&priv->pci_dev->dev);
@ -935,6 +939,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
iowrite8(SMBHSTSTS_INUSE_STS | STATUS_FLAGS, SMBHSTSTS(priv));
pm_runtime_put_autosuspend(&priv->pci_dev->dev);
mutex_unlock(&priv->acpi_lock);
return ret;
}
@ -1465,7 +1470,7 @@ i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
* further access from the driver itself. This device is now owned
* by the system firmware.
*/
i2c_lock_bus(&priv->adapter, I2C_LOCK_SEGMENT);
mutex_lock(&priv->acpi_lock);
if (!priv->acpi_reserved && i801_acpi_is_smbus_ioport(priv, address)) {
priv->acpi_reserved = true;
@ -1485,7 +1490,7 @@ i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
else
status = acpi_os_write_port(address, (u32)*value, bits);
i2c_unlock_bus(&priv->adapter, I2C_LOCK_SEGMENT);
mutex_unlock(&priv->acpi_lock);
return status;
}
@ -1545,6 +1550,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
priv->adapter.dev.parent = &dev->dev;
acpi_use_parent_companion(&priv->adapter.dev);
priv->adapter.retries = 3;
mutex_init(&priv->acpi_lock);
priv->pci_dev = dev;
priv->features = id->driver_data;