While testing/debugging the tty driver I've changed to use the
tty_port_* helper functions, I noticed there are two
tty_port_operation fields that I'm not providing: destruct() and
drop(). There's an example of destruct() usage in the hvc driver and a
comment in tty.h explaining when it's called, so that's fairly
obvious.
I haven't been able to figure out the purpose of the drop() callback.
It's not used anywhere and there is no comment in tty.h hinting at its
purpose.
Looking at tty_port_close() shows that drop() is called during close()
of port with a reference count > 1. IOW, close() calls drop() in the
cases where it isn't going to call shutdown().
There doesn't seem to be a corresponding "raise" callback during
open() when activate() isn't going to be called, and I can't think of
any use for either drop or raise...
--
Grant Edwards grant.b.edwards Yow! My mind is a potato
at field ...
gmail.com
--
To unsubscribe from this list: send the line "unsubscribe linux-serial" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
