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Date: Fri, 27 Nov 2015 16:39:10 -0500 From: Peter Hurley <peter@...leysoftware.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>, Peter Hurley <peter@...leysoftware.com> Subject: [PATCH 13/19] tty: Handle NULL tty->ldisc In preparation of destroying line discipline on hangup, fix ldisc core operations to properly handle when the tty's ldisc is NULL. Signed-off-by: Peter Hurley <peter@...leysoftware.com> --- drivers/tty/tty_ldisc.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index e9a19c9..680c049 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -269,7 +269,8 @@ const struct file_operations tty_ldiscs_proc_fops = { struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *tty) { ldsem_down_read(&tty->ldisc_sem, MAX_SCHEDULE_TIMEOUT); - WARN_ON(!tty->ldisc); + if (!tty->ldisc) + ldsem_up_read(&tty->ldisc_sem); return tty->ldisc; } EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait); @@ -482,7 +483,7 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld) if (ret) clear_bit(TTY_LDISC_OPEN, &tty->flags); - tty_ldisc_debug(tty, "%p: opened\n", tty->ldisc); + tty_ldisc_debug(tty, "%p: opened\n", ld); return ret; } return 0; @@ -503,7 +504,7 @@ static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld) clear_bit(TTY_LDISC_OPEN, &tty->flags); if (ld->ops->close) ld->ops->close(tty); - tty_ldisc_debug(tty, "%p: closed\n", tty->ldisc); + tty_ldisc_debug(tty, "%p: closed\n", ld); } /** @@ -566,6 +567,11 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) if (retval) goto err; + if (!tty->ldisc) { + retval = -EIO; + goto out; + } + /* Check the no-op case */ if (tty->ldisc->ops->num == ldisc) goto out; @@ -681,7 +687,7 @@ void tty_ldisc_hangup(struct tty_struct *tty) int reset = tty->driver->flags & TTY_DRIVER_RESET_TERMIOS; int err = 0; - tty_ldisc_debug(tty, "%p: closing\n", tty->ldisc); + tty_ldisc_debug(tty, "%p: hangup\n", tty->ldisc); ld = tty_ldisc_ref(tty); if (ld != NULL) { @@ -765,6 +771,8 @@ int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty) static void tty_ldisc_kill(struct tty_struct *tty) { + if (!tty->ldisc) + return; /* * Now kill off the ldisc */ -- 2.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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