uwb: add symlinks in sysfs between radio controllers and PALs

Add a facility for PALs to have symlinks to their radio controller
(and vice-versa) and make WUSB host controllers use this.

Signed-off-by: David Vrabel <david.vrabel@csr.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/uwb/pal.c b/drivers/uwb/pal.c
index 5508993a820e..1afb38eacb9a 100644
--- a/drivers/uwb/pal.c
+++ b/drivers/uwb/pal.c
@@ -39,6 +39,21 @@ EXPORT_SYMBOL_GPL(uwb_pal_init);
  */
 int uwb_pal_register(struct uwb_rc *rc, struct uwb_pal *pal)
 {
+        int ret;
+
+        if (pal->device) {
+                ret = sysfs_create_link(&pal->device->kobj,
+                                        &rc->uwb_dev.dev.kobj, "uwb_rc");
+                if (ret < 0)
+                        return ret;
+                ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
+                                        &pal->device->kobj, pal->name);
+                if (ret < 0) {
+                        sysfs_remove_link(&pal->device->kobj, "uwb_rc");
+                        return ret;
+                }
+        }
+
         spin_lock(&rc->pal_lock);
         list_add(&pal->node, &rc->pals);
         spin_unlock(&rc->pal_lock);
@@ -57,6 +72,11 @@ void uwb_pal_unregister(struct uwb_rc *rc, struct uwb_pal *pal)
         spin_lock(&rc->pal_lock);
         list_del(&pal->node);
         spin_unlock(&rc->pal_lock);
+
+        if (pal->device) {
+                sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
+                sysfs_remove_link(&pal->device->kobj, "uwb_rc");
+        }
 }
 EXPORT_SYMBOL_GPL(uwb_pal_unregister);