netdev - [patch for 2.6.31? 2/2] gigaset: really fix chars_in

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Message-Id: <200908062219.n76MJXhY024495@imap1.linux-foundation.org>
Date:	Thu, 06 Aug 2009 15:19:32 -0700
From:	akpm@...ux-foundation.org
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org, tilman@...p.cc
Subject: [patch for 2.6.31? 2/2] gigaset: really fix chars_in_buffer

From: Tilman Schmidt <tilman@...p.cc>

The tty_operation chars_in_buffer() is not allowed to return a negative
value to signal an error.  Corrects the problem flagged by commit
23198fda7182969b619613a555f8645fdc3dc334, "tty: fix chars_in_buffers".

Signed-off-by: Tilman Schmidt <tilman@...p.cc>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/isdn/gigaset/interface.c |   19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff -puN drivers/isdn/gigaset/interface.c~gigaset-really-fix-chars_in_buffer drivers/isdn/gigaset/interface.c
--- a/drivers/isdn/gigaset/interface.c~gigaset-really-fix-chars_in_buffer
+++ a/drivers/isdn/gigaset/interface.c
@@ -408,33 +408,28 @@ static int if_write_room(struct tty_stru
 	return retval;
 }
 
-/* FIXME: This function does not have error returns */
-
 static int if_chars_in_buffer(struct tty_struct *tty)
 {
 	struct cardstate *cs;
-	int retval = -ENODEV;
+	int retval = 0;
 
 	cs = (struct cardstate *) tty->driver_data;
 	if (!cs) {
 		pr_err("%s: no cardstate\n", __func__);
-		return -ENODEV;
+		return 0;
 	}
 
 	gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
-	if (mutex_lock_interruptible(&cs->mutex))
-		return -ERESTARTSYS; // FIXME -EINTR?
+	mutex_lock(&cs->mutex);
 
-	if (!cs->connected) {
+	if (!cs->connected)
 		gig_dbg(DEBUG_IF, "not connected");
-		retval = -ENODEV;
-	} else if (!cs->open_count)
+	else if (!cs->open_count)
 		dev_warn(cs->dev, "%s: device not opened\n", __func__);
-	else if (cs->mstate != MS_LOCKED) {
+	else if (cs->mstate != MS_LOCKED)
 		dev_warn(cs->dev, "can't write to unlocked device\n");
-		retval = -EBUSY;
-	} else
+	else
 		retval = cs->ops->chars_in_buffer(cs);
 
 	mutex_unlock(&cs->mutex);
_
--
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