Bluetooth: 6lowpan: Remove PSM setting code

Removing PSM setting debugfs interface as the IPSP has a well
defined PSM value that should be used.

The patch introduces enable flag that can be used to toggle
6lowpan on/off.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 31 insertions, 35 deletions

diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index c989253737f0..1742b849fcff 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -31,7 +31,7 @@
 
 #define VERSION "0.1"
 
-static struct dentry *lowpan_psm_debugfs;
+static struct dentry *lowpan_enable_debugfs;
 static struct dentry *lowpan_control_debugfs;
 
 #define IFACE_NAME_TEMPLATE "bt%d"
@@ -55,11 +55,7 @@ struct skb_cb {
 static LIST_HEAD(bt_6lowpan_devices);
 static DEFINE_SPINLOCK(devices_lock);
 
-/* If psm is set to 0 (default value), then 6lowpan is disabled.
- * Other values are used to indicate a Protocol Service Multiplexer
- * value for 6lowpan.
- */
-static u16 psm_6lowpan;
+static bool enable_6lowpan;
 
 /* We are listening incoming connections via this channel
  */
@@ -761,7 +757,7 @@ static bool is_bt_6lowpan(struct hci_conn *hcon)
         if (hcon->type != LE_LINK)
                 return false;
 
-        if (!psm_6lowpan)
+        if (!enable_6lowpan)
                 return false;
 
         return true;
@@ -1085,7 +1081,7 @@ static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
         if (!pchan)
                 return -EINVAL;
 
-        err = l2cap_chan_connect(pchan, cpu_to_le16(psm_6lowpan), 0,
+        err = l2cap_chan_connect(pchan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
                                  addr, dst_type);
 
         BT_DBG("chan %p err %d", pchan, err);
@@ -1118,7 +1114,7 @@ static struct l2cap_chan *bt_6lowpan_listen(void)
         struct l2cap_chan *pchan;
         int err;
 
-        if (psm_6lowpan == 0)
+        if (!enable_6lowpan)
                 return NULL;
 
         pchan = chan_get();
@@ -1130,10 +1126,9 @@ static struct l2cap_chan *bt_6lowpan_listen(void)
 
         atomic_set(&pchan->nesting, L2CAP_NESTING_PARENT);
 
-        BT_DBG("psm 0x%04x chan %p src type %d", psm_6lowpan, pchan,
-               pchan->src_type);
+        BT_DBG("chan %p src type %d", pchan, pchan->src_type);
 
-        err = l2cap_add_psm(pchan, addr, cpu_to_le16(psm_6lowpan));
+        err = l2cap_add_psm(pchan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
         if (err) {
                 l2cap_chan_put(pchan);
                 BT_ERR("psm cannot be added err %d", err);
@@ -1219,22 +1214,23 @@ static void disconnect_all_peers(void)
         spin_unlock(&devices_lock);
 }
 
-struct set_psm {
+struct set_enable {
         struct work_struct work;
-        u16 psm;
+        bool flag;
 };
 
-static void do_psm_set(struct work_struct *work)
+static void do_enable_set(struct work_struct *work)
 {
-        struct set_psm *set_psm = container_of(work, struct set_psm, work);
+        struct set_enable *set_enable = container_of(work,
+                                                     struct set_enable, work);
 
-        if (set_psm->psm == 0 || psm_6lowpan != set_psm->psm)
+        if (!set_enable->flag || enable_6lowpan != set_enable->flag)
                 /* Disconnect existing connections if 6lowpan is
-                 * disabled (psm = 0), or if psm changes.
+                 * disabled
                  */
                 disconnect_all_peers();
 
-        psm_6lowpan = set_psm->psm;
+        enable_6lowpan = set_enable->flag;
 
         if (listen_chan) {
                 l2cap_chan_close(listen_chan, 0);
@@ -1243,33 +1239,33 @@ static void do_psm_set(struct work_struct *work)
 
         listen_chan = bt_6lowpan_listen();
 
-        kfree(set_psm);
+        kfree(set_enable);
 }
 
-static int lowpan_psm_set(void *data, u64 val)
+static int lowpan_enable_set(void *data, u64 val)
 {
-        struct set_psm *set_psm;
+        struct set_enable *set_enable;
 
-        set_psm = kzalloc(sizeof(*set_psm), GFP_KERNEL);
-        if (!set_psm)
+        set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
+        if (!set_enable)
                 return -ENOMEM;
 
-        set_psm->psm = val;
-        INIT_WORK(&set_psm->work, do_psm_set);
+        set_enable->flag = !!val;
+        INIT_WORK(&set_enable->work, do_enable_set);
 
-        schedule_work(&set_psm->work);
+        schedule_work(&set_enable->work);
 
         return 0;
 }
 
-static int lowpan_psm_get(void *data, u64 *val)
+static int lowpan_enable_get(void *data, u64 *val)
 {
-        *val = psm_6lowpan;
+        *val = enable_6lowpan;
         return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(lowpan_psm_fops, lowpan_psm_get,
-                        lowpan_psm_set, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
+                        lowpan_enable_set, "%llu\n");
 
 static ssize_t lowpan_control_write(struct file *fp,
                                     const char __user *user_buffer,
@@ -1439,9 +1435,9 @@ static struct notifier_block bt_6lowpan_dev_notifier = {
 
 static int __init bt_6lowpan_init(void)
 {
-        lowpan_psm_debugfs = debugfs_create_file("6lowpan_psm", 0644,
-                                                 bt_debugfs, NULL,
-                                                 &lowpan_psm_fops);
+        lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
+                                                    bt_debugfs, NULL,
+                                                    &lowpan_enable_fops);
         lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
                                                      bt_debugfs, NULL,
                                                      &lowpan_control_fops);
@@ -1451,7 +1447,7 @@ static int __init bt_6lowpan_init(void)
 
 static void __exit bt_6lowpan_exit(void)
 {
-        debugfs_remove(lowpan_psm_debugfs);
+        debugfs_remove(lowpan_enable_debugfs);
         debugfs_remove(lowpan_control_debugfs);
 
         if (listen_chan) {