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When getting unexpected data while waiting for an acknowledgement it does not matter what command phase is currently executed, and ps2_handle_ack() should indicate that no further processing is needed for the received data byte. Remove PS2_FLAG_ACK_CMD and associated handling. Note that while it is possible to make ps2_handle_ack (and ps2_handle_repsonse) return void, it will be done when the code will be converted to common PS/2 interrupt handler later. Reviewed-by: Raul E Rangel <rrangel@chromium.org> Link: https://lore.kernel.org/r/20230511185252.386941-3-dmitry.torokhov@gmail.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>