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path: root/drivers/char/tty_ldisc.c
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Diffstat (limited to 'drivers/char/tty_ldisc.c')
-rw-r--r--drivers/char/tty_ldisc.c51
1 files changed, 20 insertions, 31 deletions
diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c
index cbfacc0bbea..aafdbaebc16 100644
--- a/drivers/char/tty_ldisc.c
+++ b/drivers/char/tty_ldisc.c
@@ -175,34 +175,6 @@ static void put_ldops(struct tty_ldisc_ops *ldops)
}
/**
- * tty_ldisc_try_get - try and reference an ldisc
- * @disc: ldisc number
- *
- * Attempt to open and lock a line discipline into place. Return
- * the line discipline refcounted or an error.
- */
-
-static struct tty_ldisc *tty_ldisc_try_get(int disc)
-{
- struct tty_ldisc *ld;
- struct tty_ldisc_ops *ldops;
-
- ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL);
- if (ld == NULL)
- return ERR_PTR(-ENOMEM);
-
- ldops = get_ldops(disc);
- if (IS_ERR(ldops)) {
- kfree(ld);
- return ERR_CAST(ldops);
- }
-
- ld->ops = ldops;
- atomic_set(&ld->users, 1);
- return ld;
-}
-
-/**
* tty_ldisc_get - take a reference to an ldisc
* @disc: ldisc number
*
@@ -218,14 +190,31 @@ static struct tty_ldisc *tty_ldisc_try_get(int disc)
static struct tty_ldisc *tty_ldisc_get(int disc)
{
struct tty_ldisc *ld;
+ struct tty_ldisc_ops *ldops;
if (disc < N_TTY || disc >= NR_LDISCS)
return ERR_PTR(-EINVAL);
- ld = tty_ldisc_try_get(disc);
- if (IS_ERR(ld)) {
+
+ /*
+ * Get the ldisc ops - we may need to request them to be loaded
+ * dynamically and try again.
+ */
+ ldops = get_ldops(disc);
+ if (IS_ERR(ldops)) {
request_module("tty-ldisc-%d", disc);
- ld = tty_ldisc_try_get(disc);
+ ldops = get_ldops(disc);
+ if (IS_ERR(ldops))
+ return ERR_CAST(ldops);
+ }
+
+ ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL);
+ if (ld == NULL) {
+ put_ldops(ldops);
+ return ERR_PTR(-ENOMEM);
}
+
+ ld->ops = ldops;
+ atomic_set(&ld->users, 1);
return ld;
}