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tty: Avoid unnecessary temporaries for tty->ldisc 

tty_ldisc_setup() is race-free and can reference tty->ldisc without
snapshots.

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 22:41:08 -08:00 committed by Greg Kroah-Hartman
parent 133b1306f2
commit 9de2a7cef9
1 changed files with 2 additions and 5 deletions
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7
drivers/tty/tty_ldisc.c
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@ -752,17 +752,14 @@ void tty_ldisc_hangup(struct tty_struct *tty, bool reinit)
int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty)
{
struct tty_ldisc *ld = tty->ldisc;
int retval;
retval = tty_ldisc_open(tty, ld);
int retval = tty_ldisc_open(tty, tty->ldisc);
if (retval)
return retval;
if (o_tty) {
retval = tty_ldisc_open(o_tty, o_tty->ldisc);
if (retval) {
tty_ldisc_close(tty, ld);
tty_ldisc_close(tty, tty->ldisc);
return retval;
}
}