linux-kernel - [PATCH 63/68] TTY: pdc

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Message-Id: <1330955575-26641-64-git-send-email-jslaby@suse.cz>
Date:	Mon,  5 Mar 2012 14:52:50 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	gregkh@...uxfoundation.org
Cc:	alan@...ux.intel.com, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Kyle McMartin <kyle@...artin.ca>, Helge Deller <deller@....de>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>
Subject: [PATCH 63/68] TTY: pdc_cons, fix racy tty test

The tty->count test in the timer was racy. Let's remove the test and
properly delete the timer and wait for the body to finish using _sync
version of del_timer.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Kyle McMartin <kyle@...artin.ca>
Cc: Helge Deller <deller@....de>
Cc: "James E.J. Bottomley" <jejb@...isc-linux.org>
---
 arch/parisc/kernel/pdc_cons.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
index fc770be..c1db65f 100644
--- a/arch/parisc/kernel/pdc_cons.c
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -103,7 +103,7 @@ static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
 static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
 {
 	if (!tty->count)
-		del_timer(&pdc_console_timer);
+		del_timer_sync(&pdc_console_timer);
 }
 
 static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
@@ -153,7 +153,7 @@ static void pdc_console_poll(unsigned long unused)
 	if (count)
 		tty_flip_buffer_push(tty);
 
-	if (tty->count && (pdc_cons.flags & CON_ENABLED))
+	if (pdc_cons.flags & CON_ENABLED)
 		mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
 }
 
-- 
1.7.9.2


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