try harder to load tty ldisc driver

Currently function tty_ldisc_get() tries to load an ldisc driver module
only when tty_ldisc_try_get() returns -EAGAIN. This happens only if
module is being unloaded. If ldisc module is not loaded
tty_ldisc_try_get() returns -EINVAL and this case is not handled in
tty_ldisc_get(), so request_module() is not called.

Attached patch fixes this by calling request_module() if
tty_ldisc_try_get() returned any error code.

I discovered this when my UMTS modem stopped working with 2.6.27-rc1
because module ppp_async was not loaded.
Signed-off-by: Eugeniy Meshcheryakov <eugen@debian.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/tty_ldisc.c

@@ -169,7 +169,7 @@ static int tty_ldisc_get(int disc, struct tty_ldisc *ld)
 	if (disc < N_TTY || disc >= NR_LDISCS)
 		return -EINVAL;
 	err = tty_ldisc_try_get(disc, ld);
-	if (err == -EAGAIN) {
+	if (err < 0) {
 		request_module("tty-ldisc-%d", disc);
 		err = tty_ldisc_try_get(disc, ld);
 	}