(4/6) bcm57xx: switch-core.c/switch-robo.c check for port already registered

This patch prevents switch-robo.c from attempting robo_probe on a port
that is already registered.  robo_probe will adjust kernel reference counts
if it detects a switch on the port.  If this patch wasn't applied, the
wrt350n would hang on reboot, waiting for the network driver reference count
to reach zero indefinitely.

Signed-off-by: Ben Pfountz <netprince (at) vt (dot) edu>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11469 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/switch/src/switch-core.c b/package/switch/src/switch-core.c
index 87aa972..c34386b 100644 (file)
--- a/package/switch/src/switch-core.c
+++ b/package/switch/src/switch-core.c
@@ -404,6 +404,21 @@ switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf)
 }
 
 
+int switch_device_registered (char* device) {
+       struct list_head *pos;
+       switch_driver *new;
+
+       list_for_each(pos, &drivers.list) {
+               if (strcmp(list_entry(pos, switch_driver, list)->interface, device) == 0) {
+                       printk("There is already a switch registered on the device '%s'\n", device);
+                       return -EINVAL;
+               }
+       }
+
+       return 0;
+}
+
+
 int switch_register_driver(switch_driver *driver)
 {
        struct list_head *pos;
@@ -476,6 +491,7 @@ static void __exit switch_exit(void)
 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
 MODULE_LICENSE("GPL");
 
+EXPORT_SYMBOL(switch_device_registered);
 EXPORT_SYMBOL(switch_register_driver);
 EXPORT_SYMBOL(switch_unregister_driver);
 EXPORT_SYMBOL(switch_parse_vlan);

diff --git a/package/switch/src/switch-core.h b/package/switch/src/switch-core.h
index 5a64efb..31c81f6 100644 (file)
--- a/package/switch/src/switch-core.h
+++ b/package/switch/src/switch-core.h
@@ -42,6 +42,7 @@ typedef struct {
 } switch_vlan_config;
 
 
+extern int switch_device_registered (char* device);
 extern int switch_register_driver(switch_driver *driver);
 extern void switch_unregister_driver(char *name);
 extern switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf);

diff --git a/package/switch/src/switch-robo.c b/package/switch/src/switch-robo.c
index 045dce1..779b89f 100644 (file)
--- a/package/switch/src/switch-robo.c
+++ b/package/switch/src/switch-robo.c
@@ -528,7 +528,8 @@ static int __init robo_init(void)
 
        device = strdup("ethX");
        for (device[3] = '0'; (device[3] <= '3') && notfound; device[3]++) {
-               notfound = robo_probe(device);
+               if (! switch_device_registered (device))
+                       notfound = robo_probe(device);
        }
        device[3]--;