i2c: i801: Fix a refactoring that broke a touchpad on Lenovo P1

JIRA: https://issues.redhat.com/browse/RHEL-47426

commit d1ef7a9
Author: Maxim Levitsky <mlevitsk@redhat.com>
Date:   Thu Mar 21 10:19:19 2024 -0400

    i2c: i801: Fix a refactoring that broke a touchpad on Lenovo P1

    Commit 857cc04 ("i2c: i801: Add helper i801_get_block_len")
    introduced a slight functional change: the status variable is now
    overwritten with the length of an SMBUS tranasaction,
    even in case of success.

    This breaks the touchpad on at least my Lenovo P1:

    rmi4_physical rmi4-00: Read PDT entry at 0x00e9 failed, code: -6.
    rmi4_physical rmi4-00: RMI initial reset failed! Continuing in spite of this.
    rmi4_physical rmi4-00: Read PDT entry at 0x00e9 failed, code: -6.
    rmi4_physical rmi4-00: IRQ counting failed with code -6.

    Fixes: 857cc04 ("i2c: i801: Add helper i801_get_block_len")
    Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
    Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
    Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

drivers/i2c/busses/i2c-i801.c

@@ -538,11 +538,12 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
 
 	if (read_write == I2C_SMBUS_READ ||
 	    command == I2C_SMBUS_BLOCK_PROC_CALL) {
-		status = i801_get_block_len(priv);
-		if (status < 0)
+		len = i801_get_block_len(priv);
+		if (len < 0) {
+			status = len;
 			goto out;
+		}
 
-		len = status;
 		data->block[0] = len;
 		inb_p(SMBHSTCNT(priv));	/* reset the data buffer index */
 		for (i = 0; i < len; i++)