From: Daeseok Youn <daeseok.youn@gmail.com>
Date: Thu, 3 Jul 2014 10:12:31 +0000 (+0900)
Subject: staging: dgnc: Fix unsigned value for less than zero
X-Git-Tag: v3.17-rc1~123^2~1119
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3098e514686305f03d695a2c5c73ba96ad4cc273;p=karo-tx-linux.git

staging: dgnc: Fix unsigned value for less than zero

The "un->un_open_count" is unsigned variable, so it cannot
be less than zero.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 8081621cc9c0..f7409d909781 100644
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -1636,10 +1636,10 @@ static void dgnc_tty_close(struct tty_struct *tty, struct file *file)
 		un->un_open_count = 1;
 	}
 
-	if (--un->un_open_count < 0) {
+	if (un->un_open_count)
+		un->un_open_count--;
+	else
 		APR(("bad serial port open count of %d\n", un->un_open_count));
-		un->un_open_count = 0;
-	}
 
 	ch->ch_open_count--;