From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Hurley Subject: [PATCH 1/4] net/irda: Fix port open counts Date: Tue, 5 Mar 2013 11:09:04 -0500 Message-ID: <1362499747-4262-2-git-send-email-peter@hurleysoftware.com> References: <1362371063.3221.185.camel@thor.lan> <1362499747-4262-1-git-send-email-peter@hurleysoftware.com> Cc: Sasha Levin , Greg Kroah-Hartman , netdev@vger.kernel.org, Jiri Slaby , linux-kernel@vger.kernel.org, Peter Hurley To: David Miller , Samuel Ortiz Return-path: In-Reply-To: <1362499747-4262-1-git-send-email-peter@hurleysoftware.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Saving the port count bump is unsafe. If the tty is hung up while this open was blocking, the port count is zeroed. Explicitly check if the tty was hung up while blocking, and correct the port count if not. Signed-off-by: Peter Hurley --- net/irda/ircomm/ircomm_tty.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c index 9a5fd3c..1721dc7 100644 --- a/net/irda/ircomm/ircomm_tty.c +++ b/net/irda/ircomm/ircomm_tty.c @@ -280,7 +280,7 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, struct tty_port *port = &self->port; DECLARE_WAITQUEUE(wait, current); int retval; - int do_clocal = 0, extra_count = 0; + int do_clocal = 0; unsigned long flags; IRDA_DEBUG(2, "%s()\n", __func__ ); @@ -315,10 +315,8 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, __FILE__, __LINE__, tty->driver->name, port->count); spin_lock_irqsave(&port->lock, flags); - if (!tty_hung_up_p(filp)) { - extra_count = 1; + if (!tty_hung_up_p(filp)) port->count--; - } spin_unlock_irqrestore(&port->lock, flags); port->blocked_open++; @@ -361,12 +359,10 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, __set_current_state(TASK_RUNNING); remove_wait_queue(&port->open_wait, &wait); - if (extra_count) { - /* ++ is not atomic, so this should be protected - Jean II */ - spin_lock_irqsave(&port->lock, flags); + spin_lock_irqsave(&port->lock, flags); + if (!tty_hung_up_p(filp)) port->count++; - spin_unlock_irqrestore(&port->lock, flags); - } + spin_unlock_irqrestore(&port->lock, flags); port->blocked_open--; IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", -- 1.8.1.2