Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753222AbaJPU15 (ORCPT ); Thu, 16 Oct 2014 16:27:57 -0400 Received: from mailout32.mail01.mtsvc.net ([216.70.64.70]:42453 "EHLO n23.mail01.mtsvc.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752830AbaJPUZt (ORCPT ); Thu, 16 Oct 2014 16:25:49 -0400 From: Peter Hurley To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, Jiri Slaby , linux-serial@vger.kernel.org, One Thousand Gnomes , Peter Hurley Subject: [PATCH -next 05/27] tty: Check tty->count instead of TTY_CLOSING in tty_reopen() Date: Thu, 16 Oct 2014 16:25:03 -0400 Message-Id: <1413491125-20134-6-git-send-email-peter@hurleysoftware.com> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1413491125-20134-1-git-send-email-peter@hurleysoftware.com> References: <1413491125-20134-1-git-send-email-peter@hurleysoftware.com> X-Authenticated-User: 990527 peter@hurleysoftware.com X-MT-ID: 8FA290C2A27252AACF65DBC4A42F3CE3735FB2A4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Although perhaps not obvious, the TTY_CLOSING bit is set when the tty count has been decremented to 0 (which occurs while holding tty_lock). The only other case when tty count is 0 during a re-open is when a legacy BSD pty master has been opened in parallel but after the pty slave, which is unsupported and returns an error. Thus !tty->count contains the complete set of degenerate conditions under which a tty open fails. Signed-off-by: Peter Hurley --- drivers/tty/tty_io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 5b6253f..52bcdd3 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1452,7 +1452,7 @@ static int tty_reopen(struct tty_struct *tty) { struct tty_driver *driver = tty->driver; - if (test_bit(TTY_CLOSING, &tty->flags)) + if (!tty->count) return -EIO; if (driver->type == TTY_DRIVER_TYPE_PTY && -- 2.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/