Bluetooth: Expose inquiry_cache debugfs only on BR/EDR controllers

The inquiry_cache debugfs entry is only valid for BR/EDR capable
controllers. In case of single mode LE-only controllers that
entry is not valid.

Move the creating of the debugfs entries to the end of controller
init and only create the inquiry_cache entry if BR/EDR is actually
supported.

At the same time this avoids creating any debugfs entries for
AMP controllers since none of the entries are valid there.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2af0bac..73c8def 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -27,8 +27,8 @@
 
 #include <linux/export.h>
 #include <linux/idr.h>
-
 #include <linux/rfkill.h>
+#include <linux/debugfs.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -55,6 +55,44 @@ static void hci_notify(struct hci_dev *hdev, int event)
        hci_sock_dev_event(hdev, event);
 }
 
+/* ---- HCI debugfs entries ---- */
+
+static int inquiry_cache_show(struct seq_file *f, void *p)
+{
+       struct hci_dev *hdev = f->private;
+       struct discovery_state *cache = &hdev->discovery;
+       struct inquiry_entry *e;
+
+       hci_dev_lock(hdev);
+
+       list_for_each_entry(e, &cache->all, all) {
+               struct inquiry_data *data = &e->data;
+               seq_printf(f, "%pMR %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
+                          &data->bdaddr,
+                          data->pscan_rep_mode, data->pscan_period_mode,
+                          data->pscan_mode, data->dev_class[2],
+                          data->dev_class[1], data->dev_class[0],
+                          __le16_to_cpu(data->clock_offset),
+                          data->rssi, data->ssp_mode, e->timestamp);
+       }
+
+       hci_dev_unlock(hdev);
+
+       return 0;
+}
+
+static int inquiry_cache_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, inquiry_cache_show, inode->i_private);
+}
+
+static const struct file_operations inquiry_cache_fops = {
+       .open           = inquiry_cache_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
 /* ---- HCI requests ---- */
 
 static void hci_req_sync_complete(struct hci_dev *hdev, u8 result)
@@ -734,7 +772,22 @@ static int __hci_init(struct hci_dev *hdev)
        if (err < 0)
                return err;
 
-       return __hci_req_sync(hdev, hci_init4_req, 0, HCI_INIT_TIMEOUT);
+       err = __hci_req_sync(hdev, hci_init4_req, 0, HCI_INIT_TIMEOUT);
+       if (err < 0)
+               return err;
+
+       /* Only create debugfs entries during the initial setup
+        * phase and not every time the controller gets powered on.
+        */
+       if (!test_bit(HCI_SETUP, &hdev->dev_flags))
+               return 0;
+
+       if (lmp_bredr_capable(hdev)) {
+               debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
+                                   hdev, &inquiry_cache_fops);
+       }
+
+       return 0;
 }
 
 static void hci_scan_req(struct hci_request *req, unsigned long opt)

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index edf623a..65ecb9e 100644 (file)
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -396,42 +396,6 @@ static struct device_type bt_host = {
        .release = bt_host_release,
 };
 
-static int inquiry_cache_show(struct seq_file *f, void *p)
-{
-       struct hci_dev *hdev = f->private;
-       struct discovery_state *cache = &hdev->discovery;
-       struct inquiry_entry *e;
-
-       hci_dev_lock(hdev);
-
-       list_for_each_entry(e, &cache->all, all) {
-               struct inquiry_data *data = &e->data;
-               seq_printf(f, "%pMR %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
-                          &data->bdaddr,
-                          data->pscan_rep_mode, data->pscan_period_mode,
-                          data->pscan_mode, data->dev_class[2],
-                          data->dev_class[1], data->dev_class[0],
-                          __le16_to_cpu(data->clock_offset),
-                          data->rssi, data->ssp_mode, e->timestamp);
-       }
-
-       hci_dev_unlock(hdev);
-
-       return 0;
-}
-
-static int inquiry_cache_open(struct inode *inode, struct file *file)
-{
-       return single_open(file, inquiry_cache_show, inode->i_private);
-}
-
-static const struct file_operations inquiry_cache_fops = {
-       .open           = inquiry_cache_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = single_release,
-};
-
 static int blacklist_show(struct seq_file *f, void *p)
 {
        struct hci_dev *hdev = f->private;
@@ -562,9 +526,6 @@ int hci_add_sysfs(struct hci_dev *hdev)
        if (!hdev->debugfs)
                return 0;
 
-       debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
-                           hdev, &inquiry_cache_fops);
-
        debugfs_create_file("blacklist", 0444, hdev->debugfs,
                            hdev, &blacklist_fops);