68dbac0a58
cros_ec_lpc_io_bytes_mec was returning a u8 checksum of all bytes read/written, which didn't leave room to indicate errors. Change this u8 to an int where negative values indicate an error, and non-negative values are the checksum as before. Tested-by: Dustin L. Howett <dustin@howett.net> Signed-off-by: Ben Walsh <ben@jubnut.com> Link: https://lore.kernel.org/r/20240605063351.14836-2-ben@jubnut.com Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>