io_edgeport: Fix various bogus returns to the tty layer

The edgeport reports negative error codes to functions that do not
expect them. This can cause ports to jam forever

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index b4bd6847a96d..bfa508ddb0fe 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -1404,15 +1404,15 @@ static int edge_write_room(struct tty_struct *tty)
         dbg("%s", __func__);
 
         if (edge_port == NULL)
-                return -ENODEV;
+                return 0;
         if (edge_port->closePending)
-                return -ENODEV;
+                return 0;
 
         dbg("%s - port %d", __func__, port->number);
 
         if (!edge_port->open) {
                 dbg("%s - port not opened", __func__);
-                return -EINVAL;
+                return 0;
         }
 
         /* total of both buffers is still txCredit */
@@ -1444,13 +1444,13 @@ static int edge_chars_in_buffer(struct tty_struct *tty)
         dbg("%s", __func__);
 
         if (edge_port == NULL)
-                return -ENODEV;
+                return 0;
         if (edge_port->closePending)
-                return -ENODEV;
+                return 0;
 
         if (!edge_port->open) {
                 dbg("%s - port not opened", __func__);
-                return -EINVAL;
+                return 0;
         }
 
         spin_lock_irqsave(&edge_port->ep_lock, flags);