lkml.org 
[lkml]   [2009]   [Oct]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[047/136] tty: gigaset: really fix chars_in_buffer
2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Tilman Schmidt <tilman@imap.cc>

commit a4304f2d5a3823deea894026ec95e43b33912357 upstream.

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@imap.cc>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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

--- a/drivers/isdn/gigaset/interface.c
+++ b/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);



\
 
 \ /
  Last update: 2009-10-02 04:15    [W:0.578 / U:15.440 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site