i2c-i801: Clear only status bits in HST_STS

Writing back the whole status register could clear unwanted bits.
In particular, it could clear the "INUSE_STS" bit, which is a
'hardware semaphore', that might be useful to use some day.
To prepare for this, let's ban writing back the whole status to register
HST_STS, of which this is the only instance.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-i801.c

@@ -300,7 +300,7 @@ static void i801_wait_hwpec(struct i801_priv *priv)
 	if (timeout > MAX_RETRIES)
 		dev_dbg(&priv->pci_dev->dev, "PEC Timeout!\n");
 
-	outb_p(status, SMBHSTSTS(priv));
+	outb_p(status & STATUS_FLAGS, SMBHSTSTS(priv));
 }
 
 static int i801_block_transaction_by_block(struct i801_priv *priv,