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tty: Fix comments for tty_ldisc_get()

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tty_ldisc_get() returns ERR_PTR() values if unsuccessful, not NULL;
fix function header documentation.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-01-10 22:40:59 -08:00 committed by Greg Kroah-Hartman
parent ece53405a1
commit c0cc1c5d6b
1 changed files with 10 additions and 3 deletions
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13
drivers/tty/tty_ldisc.c
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@ -140,9 +140,16 @@ static void put_ldops(struct tty_ldisc_ops *ldops)
* @disc: ldisc number
*
* Takes a reference to a line discipline. Deals with refcounts and
* module locking counts. Returns NULL if the discipline is not available.
* Returns a pointer to the discipline and bumps the ref count if it is
* available
* module locking counts.
*
* Returns: -EINVAL if the discipline index is not [N_TTY..NR_LDISCS] or
* if the discipline is not registered
* -EAGAIN if request_module() failed to load or register the
* the discipline
* -ENOMEM if allocation failure
*
* Otherwise, returns a pointer to the discipline and bumps the
* ref count
*
* Locking:
* takes tty_ldiscs_lock to guard against ldisc races