From: Sasha Levin <sasha.levin@oracle.com>
To: samuel@sortiz.org
Cc: davem@davemloft.net, gregkh@linuxfoundation.org, jslaby@suse.cz,
peter@hurleysoftware.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Sasha Levin <sasha.levin@oracle.com>
Subject: [PATCH] ircomm: release tty before sleeping potentially indefintely
Date: Sun, 3 Mar 2013 17:35:53 -0500 [thread overview]
Message-ID: <1362350153-26225-1-git-send-email-sasha.levin@oracle.com> (raw)
ircomm_tty_block_til_ready would hold tty lock while blocking. Since the sleep
might take a long time we can prevent other processes from accessing the tty,
causing hung tasks and a dead tty.
Diagnosed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
net/irda/ircomm/ircomm_tty.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index 9a5fd3c..7844cb3 100644
--- a/net/irda/ircomm/ircomm_tty.c
+++ b/net/irda/ircomm/ircomm_tty.c
@@ -355,7 +355,9 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
__FILE__, __LINE__, tty->driver->name, port->count);
+ tty_unlock(tty);
schedule();
+ tty_lock(tty);
}
__set_current_state(TASK_RUNNING);
--
1.8.1.4
next reply other threads:[~2013-03-03 22:35 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-03 22:35 Sasha Levin [this message]
2013-03-03 22:47 ` [PATCH] ircomm: release tty before sleeping potentially indefintely David Miller
2013-03-03 23:17 ` Sasha Levin
2013-03-04 0:31 ` David Miller
2013-03-04 0:04 ` Peter Hurley
2013-03-04 0:33 ` David Miller
2013-03-04 1:06 ` Peter Hurley
2013-03-04 2:36 ` David Miller
2013-03-04 4:24 ` Peter Hurley
2013-03-05 16:09 ` [PATCH 0/4] other ircomm_tty fixes (was Re: [PATCH] ircomm: release tty before sleeping potentially indefintely) Peter Hurley
2013-03-05 16:09 ` [PATCH 1/4] net/irda: Fix port open counts Peter Hurley
2013-03-05 16:09 ` [PATCH 2/4] net/irda: Hold port lock while bumping blocked_open Peter Hurley
2013-03-05 16:09 ` [PATCH 3/4] net/irda: Use barrier to set task state Peter Hurley
2013-03-05 16:09 ` [PATCH 4/4] net/irda: Raise dtr in non-blocking open Peter Hurley
2013-03-06 4:44 ` [PATCH 0/4] other ircomm_tty fixes David Miller
2013-03-04 4:30 ` [PATCH] ircomm: release tty before sleeping potentially indefintely Peter Hurley
2013-03-04 2:23 ` Peter Hurley
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