synclink_gt fix module reference

Get module reference on open() by generic HDLC to prevent module from
unloading while interface is active.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index bbb7f1292665..2f97d2f8f916 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -1565,6 +1565,9 @@ static int hdlcdev_open(struct net_device *dev)
         int rc;
         unsigned long flags;
 
+        if (!try_module_get(THIS_MODULE))
+                return -EBUSY;
+
         DBGINFO(("%s hdlcdev_open\n", dev->name));
 
         /* generic HDLC layer open processing */
@@ -1634,6 +1637,7 @@ static int hdlcdev_close(struct net_device *dev)
         info->netcount=0;
         spin_unlock_irqrestore(&info->netlock, flags);
 
+        module_put(THIS_MODULE);
         return 0;
 }