A non-privileged user should be able to set or reset the ASYNC_SPD_*
flags on a serial port, but he actually isn't. setserial (or
TIOC[SG]SERIAL) will allow him to change these settings and will also
return those changed values afterwards even though the kernel won't
use these values for the port. Setting the custom divisor works
fine, so once root has set the ASYNC_SPD_CUST flag a normal user can
specify the divisor, but is unable to reset the port to plain 38400
baud by resetting ASYNC_SPD_CUST.
Thanks! The patches you supplied look good; I'll be bundling them
together to send to Linus with a few other serial bug fixes.
- Ted
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