According to the datasheet the block process call requires block buffer mode. The user may disable block buffer mode by module parameter disable_features, in such a case we have to clear FEATURE_BLOCK_PROC. Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx> --- drivers/i2c/busses/i2c-i801.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index 5997ba6dd..a3c19e887 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1684,6 +1684,9 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id) } priv->features &= ~disable_features; + if (!(priv->features & FEATURE_BLOCK_BUFFER)) + priv->features &= ~FEATURE_BLOCK_PROC; + err = pcim_enable_device(dev); if (err) { dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n", -- 2.34.1