snap: handle registration error and compile warning

If this module can't load, it is almost certainly because something else
is already bound to that SAP. So in that case, return the same error code
as other SAP usage, and fail the module load.

Also fixes a compiler warning about printk of non const.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/802/psnap.c b/net/802/psnap.c
index 6ed711748f26..bdbffa3cb043 100644
--- a/net/802/psnap.c
+++ b/net/802/psnap.c
@@ -95,15 +95,16 @@ static int snap_request(struct datalink_proto *dl,
 EXPORT_SYMBOL(register_snap_client);
 EXPORT_SYMBOL(unregister_snap_client);
 
-static char snap_err_msg[] __initdata =
+static const char snap_err_msg[] __initconst =
         KERN_CRIT "SNAP - unable to register with 802.2\n";
 
 static int __init snap_init(void)
 {
         snap_sap = llc_sap_open(0xAA, snap_rcv);
-
-        if (!snap_sap)
+        if (!snap_sap) {
                 printk(snap_err_msg);
+                return -EBUSY;
+        }
 
         return 0;
 }