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authorLinus Torvalds <torvalds@linux-foundation.org>2009-08-03 16:01:28 -0700
committerLive-CD User <linux@linux.site>2009-09-19 13:13:10 -0700
commit182274f85fc26ec3aa8c78dba8b0e7763af3c586 (patch)
treec8113b35eb01ff57177829623e77603111f7d2a7 /drivers/char
parentf0de0e8d3565ee7feba6228d99763d4cea2087a6 (diff)
tty-ldisc: get rid of tty_ldisc_try_get() helper function
Now that the /proc/tty/ldiscs handling doesn't play games with 'struct ldisc' any more, the only remaining user of 'tty_ldisc_try_get()' is 'tty_ldisc_get()' (note the lack of 'try'). And we're actually much better off folding the logic directly into that file, since the 'try' part was always about trying to get the ldisc operations, not the ldisc itself: and making that explicit inside of 'tty_ldisc_get()' clarifies the whole semantics. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>, Tested-by: Sergey Senozhatsky <sergey.senozhatsky@mail.by> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/char')
-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;
}