libertas: cope with both old and new mesh TLV values

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 29 insertions, 3 deletions

diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 5e2f3296be34..2409df85c2e0 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -1171,8 +1171,33 @@ int lbs_start_card(struct lbs_private *priv)
         }
         if (device_create_file(&dev->dev, &dev_attr_lbs_rtap))
                 lbs_pr_err("cannot register lbs_rtap attribute\n");
-        if (device_create_file(&dev->dev, &dev_attr_lbs_mesh))
-                lbs_pr_err("cannot register lbs_mesh attribute\n");
+
+        /* Enable mesh, if supported, and work out which TLV it uses.
+           0x100 + 291 is an unofficial value used in 5.110.20.pXX
+           0x100 + 37 is the official value used in 5.110.21.pXX
+           but we check them in that order because 20.pXX doesn't 
+           give an error -- it just silently fails. */
+
+        /* 5.110.20.pXX firmware will fail the command if the channel
+           doesn't match the existing channel. But only if the TLV
+           is correct. If the channel is wrong, _BOTH_ versions will
+           give an error to 0x100+291, and allow 0x100+37 to succeed.
+           It's just that 5.110.20.pXX will not have done anything
+           useful */
+
+        lbs_update_channel(priv);
+        priv->mesh_tlv = 0x100 + 291;
+        if (lbs_mesh_config(priv, 1)) {
+                priv->mesh_tlv = 0x100 + 37;
+                if (lbs_mesh_config(priv, 1))
+                        priv->mesh_tlv = 0;
+        }
+        if (priv->mesh_tlv) {
+                lbs_add_mesh(priv);
+
+                if (device_create_file(&dev->dev, &dev_attr_lbs_mesh))
+                        lbs_pr_err("cannot register lbs_mesh attribute\n");
+        }
 
         lbs_debugfs_init_one(priv, dev);
 
@@ -1201,7 +1226,8 @@ int lbs_stop_card(struct lbs_private *priv)
 
         lbs_debugfs_remove_one(priv);
         device_remove_file(&dev->dev, &dev_attr_lbs_rtap);
-        device_remove_file(&dev->dev, &dev_attr_lbs_mesh);
+        if (priv->mesh_tlv)
+                device_remove_file(&dev->dev, &dev_attr_lbs_mesh);
 
         /* Flush pending command nodes */
         spin_lock_irqsave(&priv->driver_lock, flags);