> I implemented the serial driver by myself, :). See the attachment.
quoted text
> I didn't save/restore terminal setting in the my_set_termios().

Driver looks fine. 

quoted text
> I trace this back till tty_tioctl(..., unsigned long arg), everytime I
> type "ENTER" key,
> the argument "arg" passed into tty_ioctl() is the address of a termios
> structure, which include wrong c_cflag. It seems once the flag is
> assigned by uart_set_options the first time, it's never changed. So
> even userspace application changed the flag, it will be set back soon.
> I'll dig into it. But I still think it's a bug.

Which application (see from current->pid) seems to be calling the
tty_ioctl with the "wrong flag" ?
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