linux-kernel - [PATCH v3 23/23] tty: Add ldisc hangup debug messages

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Message-Id: <1360095638-6624-24-git-send-email-peter@hurleysoftware.com>
Date:	Tue,  5 Feb 2013 15:20:38 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...ux.intel.com>, Jiri Slaby <jslaby@...e.cz>,
	Sasha Levin <levinsasha928@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ilya Zykov <ilya@...x.ru>, Dave Jones <davej@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v3 23/23] tty: Add ldisc hangup debug messages

Expected typical debug log:
[  582.721965] tty_open: opening pts3...
[  582.721970] tty_open: opening pts3...
[  582.721977] tty_release: pts3 (tty count=3)...
[  582.721980] tty_release: ptm3 (tty count=1)...
[  582.722015] pts3 vhangup...
[  582.722020] tty_ldisc_hangup: pts3: closing ldisc: ffff88007a920540
[  582.724128] tty_release: pts3 (tty count=2)...
[  582.724217] tty_ldisc_hangup: pts3: re-opened ldisc: ffff88007a920580
[  582.724221] tty_release: ptm3: final close
[  582.724234] tty_ldisc_release: ptm3: closing ldisc: ffff88007a920a80
[  582.724238] tty_ldisc_release: ptm3: ldisc closed
[  582.724241] tty_release: ptm3: freeing structure...
[  582.724741] tty_open: opening pts3...

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_ldisc.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 49e4825..7d3cab7 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -20,6 +20,17 @@
 #include <linux/uaccess.h>
 #include <linux/ratelimit.h>
 
+#undef LDISC_DEBUG_HANGUP
+
+#ifdef LDISC_DEBUG_HANGUP
+#define tty_ldisc_debug(tty, f, args...) ({				       \
+	char __b[64];							       \
+	printk(KERN_DEBUG "%s: %s: " f, __func__, tty_name(tty, __b), ##args); \
+})
+#else
+#define tty_ldisc_debug(tty, f, args...)
+#endif
+
 /*
  *	This guards the refcounted line discipline lists. The lock
  *	must be taken with irqs off because there are hangup path
@@ -853,6 +864,8 @@ void tty_ldisc_hangup(struct tty_struct *tty)
 	int reset = tty->driver->flags & TTY_DRIVER_RESET_TERMIOS;
 	int err = 0;
 
+	tty_ldisc_debug(tty, "closing ldisc: %p\n", tty->ldisc);
+
 	/*
 	 * FIXME! What are the locking issues here? This may me overdoing
 	 * things... This question is especially important now that we've
@@ -903,6 +916,8 @@ void tty_ldisc_hangup(struct tty_struct *tty)
 	mutex_unlock(&tty->ldisc_mutex);
 	if (reset)
 		tty_reset_termios(tty);
+
+	tty_ldisc_debug(tty, "re-opened ldisc: %p\n", tty->ldisc);
 }
 
 /**
@@ -969,6 +984,8 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
 	 * it does not race with the set_ldisc code path.
 	 */
 
+	tty_ldisc_debug(tty, "closing ldisc: %p\n", tty->ldisc);
+
 	tty_ldisc_halt(tty, o_tty, NULL, NULL, MAX_SCHEDULE_TIMEOUT);
 
 	tty_lock_pair(tty, o_tty);
@@ -980,6 +997,8 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
 	tty_unlock_pair(tty, o_tty);
 	/* And the memory resources remaining (buffers, termios) will be
 	   disposed of when the kref hits zero */
+
+	tty_ldisc_debug(tty, "ldisc closed\n");
 }
 
 /**
-- 
1.8.1.2

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