Re: PATCH: tty locking for 2.6.9rc2

[Alan Cox]

On Wed, Sep 15, 2004 at 11:26:35AM -0500, Paul Fulghum wrote:
> I tried this patch and can't change line disciplines.
> The user program waits forever on ioctl(TIOCSETD).
> I am going to add printk statements to

Is the tty currently in use - that implies maybe an ldisc leak

> Each line discipline has a refcount.
> This single refcount is modified by all
> entities using that line discipline.

Nope. tty->ldisc is a -copy- of the ldisc structure rather than a 
pointer. It has always been that way

struct tty_struct {
        int     magic;
        struct tty_driver *driver;
        int index;
	struct tty_ldisc ldisc;

...


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