[PATCH] TTY: tty_ldisc_wait_idle debug

[Jiri Slaby]

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 drivers/tty/tty_ldisc.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 512c49f..0b90801 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -26,6 +26,7 @@
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/seq_file.h>
+#include <linux/ratelimit.h>
 
 #include <linux/uaccess.h>
 #include <asm/system.h>
@@ -758,11 +759,17 @@ static void tty_reset_termios(struct tty_struct *tty)
 static int tty_ldisc_reinit(struct tty_struct *tty, int ldisc)
 {
 	struct tty_ldisc *ld = tty_ldisc_get(ldisc);
+	int ret;
 
 	if (IS_ERR(ld))
 		return -1;
 
-	WARN_ON_ONCE(tty_ldisc_wait_idle(tty));
+	ret = tty_ldisc_wait_idle(tty);
+	if (ret)
+		printk_ratelimited(KERN_DEBUG "%s: refcount of %ps is still %d\n",
+				__func__,
+				tty->ldisc->ops,
+				atomic_read(&tty->ldisc->users));
 
 	tty_ldisc_close(tty, tty->ldisc);
 	tty_ldisc_put(tty->ldisc);
-- 
1.7.6


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