From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
When adding HCI devices hci_register_dev assigns the same name
hci1 for subsequently added AMP devices. Find free device id
the same way as it is done in netdev.
...
[ 6958.381886] sysfs: cannot create duplicate filename
'/devices/virtual/bluetooth/hci1
...
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
net/bluetooth/hci_core.c | 31 +++++++++++++++++++++++--------
1 files changed, 23 insertions(+), 8 deletions(-)
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 52c7abf..e08d822 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1740,14 +1740,20 @@ int hci_le_scan(struct hci_dev *hdev, u8 type, u16 interval, u16 window,
/* Register HCI device */
int hci_register_dev(struct hci_dev *hdev)
{
- struct list_head *head = &hci_dev_list, *p;
+ struct list_head *head = &hci_dev_list;
+ struct hci_dev *d;
int i, id, error;
+ unsigned long *inuse;
BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
if (!hdev->open || !hdev->close)
return -EINVAL;
+ inuse = (unsigned long *) get_zeroed_page(GFP_KERNEL);
+ if (!inuse)
+ return -ENOMEM;
+
/* Do not allow HCI_AMP devices to register at index 0,
* so the index can be used as the AMP controller ID.
*/
@@ -1755,16 +1761,25 @@ int hci_register_dev(struct hci_dev *hdev)
write_lock(&hci_dev_list_lock);
- /* Find first available device id */
- list_for_each(p, &hci_dev_list) {
- if (list_entry(p, struct hci_dev, list)->id != id)
- break;
- head = p; id++;
- }
+ list_for_each_entry(d, &hci_dev_list, list)
+ set_bit(d->id, inuse);
+
+ i = find_first_zero_bit(inuse, sizeof(*inuse));
+ free_page((unsigned long) inuse);
+
+ id = max_t(int, i, id);
sprintf(hdev->name, "hci%d", id);
hdev->id = id;
- list_add_tail(&hdev->list, head);
+
+ /* keep hci_dev_list ordered */
+ list_for_each_entry(d, &hci_dev_list, list)
+ if (d->id + 1 == id) {
+ head = &d->list;
+ break;
+ }
+
+ list_add(&hdev->list, head);
mutex_init(&hdev->lock);
--
1.7.9.1
--
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