spmi_controller_alloc() currently returns NULL to all types of errors, which can be improved. Use appropriate error code in returns and pass the errors from used functions where possible. Signed-off-by: Fei Shao <fshao@chromium.org> Link: https://lore.kernel.org/r/20230824104101.4083400-6-fshao@chromium.org Signed-off-by: Stephen Boyd <sboyd@kernel.org> Link: https://lore.kernel.org/r/20231206231733.4031901-8-sboyd@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>