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'lock_user' allocates a host buffer to shadow a target buffer, 'unlock_user' copies that host buffer back to the target and frees the host memory. If the completion function uses the target buffer, it must be called after unlock_user to ensure the data are present. This caused the arm-compatible TARGET_SYS_READC to fail as the completion function, common_semi_readc_cb, pulled data from the target buffer which would not have been gotten the console data. I decided to fix all instances of this pattern instead of just the console_read function to make things consistent and potentially fix bugs in other cases. Signed-off-by: Keith Packard <keithp@keithp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20221012014822.1242170-1-keithp@keithp.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20230124180127.1881110-24-alex.bennee@linaro.org>