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Date: Thu, 23 Aug 2012 14:04:41 -0700 Message-ID: Subject: Re: gatt-example plugin From: John Tobias To: Anderson Lizardo Cc: linux-bluetooth@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-bluetooth-owner@vger.kernel.org List-ID: Hi Anderson, Thanks for the info. I got it working.. :) I have a follow question, I've tried different Linux kernel release for Pandaboard ES and I'm getting same kernel error( please see below). I am just wondering if (you) or someone have a patch to fix it?. [ 265.400543] [ 265.402130] ============================================= [ 265.407836] [ INFO: possible recursive locking detected ] [ 265.413543] 3.6.0-rc3 #2 Not tainted [ 265.417297] --------------------------------------------- [ 265.422973] kworker/u:0H/7 is trying to acquire lock: [ 265.428283] (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+...}, at: [] l2cap_sock_ready_cb+0x14/0x50 [bluetooth] [ 265.439575] [ 265.439575] but task is already holding lock: [ 265.445709] (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+...}, at: [] l2cap_connect_cfm+0x1a4/0x2f4 [bluetooth] [ 265.456939] [ 265.456939] other info that might help us debug this: [ 265.463775] Possible unsafe locking scenario: [ 265.463775] [ 265.470001] CPU0 [ 265.472564] ---- [ 265.475128] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP); [ 265.480651] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP); [ 265.486145] [ 265.486145] *** DEADLOCK *** [ 265.486145] [ 265.492340] May be due to missing lock nesting notation [ 265.492340] [ 265.499481] 4 locks held by kworker/u:0H/7: [ 265.503875] #0: (hdev->name){.+.+.+}, at: [] process_one_work+0x138/0x584 [ 265.512176] #1: ((&hdev->rx_work)){+.+.+.}, at: [] process_one_work+0x138/0x584 [ 265.520996] #2: (&hdev->lock){+.+.+.}, at: [] hci_le_meta_evt+0x58/0x6fc [bluetooth] [ 265.530303] #3: (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+...}, at: [] l2cap_connect_cfm+0x1a4/0x2f4 [bluetooth] [ 265.542022] [ 265.542022] stack backtrace: [ 265.546630] [] (unwind_backtrace+0x0/0xf0) from [] (__lock_acquire+0x1d00/0x1e24) [ 265.556335] [] (__lock_acquire+0x1d00/0x1e24) from [] (lock_acquire+0x98/0x100) [ 265.565826] [] (lock_acquire+0x98/0x100) from [] (lock_sock_nested+0x6c/0x78) [ 265.575225] [] (lock_sock_nested+0x6c/0x78) from [] (l2cap_sock_ready_cb+0x14/0x50 [bluetooth]) [ 265.586303] [] (l2cap_sock_ready_cb+0x14/0x50 [bluetooth]) from [] (l2cap_chan_ready+0x38/0x80 [bluetooth]) [ 265.598480] [] (l2cap_chan_ready+0x38/0x80 [bluetooth]) from [] (l2cap_connect_cfm+0x254/0x2f4 [bluetooth]) [ 265.610656] [] (l2cap_connect_cfm+0x254/0x2f4 [bluetooth]) from [] (hci_le_meta_evt+0x5e8/0x6fc [bluetooth]) [ 265.622894] [] (hci_le_meta_evt+0x5e8/0x6fc [bluetooth]) from [] (hci_event_packet+0x598/0x27c4 [bluetooth]) [ 265.635101] [] (hci_event_packet+0x598/0x27c4 [bluetooth]) from [] (hci_rx_work+0x1c0/0x358 [bluetooth]) [ 265.646942] [] (hci_rx_work+0x1c0/0x358 [bluetooth]) from [] (process_one_work+0x1b8/0x584) [ 265.657562] [] (process_one_work+0x1b8/0x584) from [] (worker_thread+0x170/0x4a4) [ 265.667266] [] (worker_thread+0x170/0x4a4) from [] (kthread+0x90/0x9c) [ 265.675964] [] (kthread+0x90/0x9c) from [] (kernel_thread_exit+0x0/0x8) Regards, John On Tue, Aug 21, 2012 at 3:41 AM, Anderson Lizardo wrote: > Hi John, > > On Mon, Aug 20, 2012 at 9:19 PM, John Tobias wrote: >> Hello Guys, >> >> I was playing with bluez-4.99 for LE. After setting the "EnableGatt to >> true" and re-start the bluetoothd, I was able to connect to the >> advertised services of the bluez. But, I could not figured out how to >> access/load the gatt_example plugin and access the services. Any >> information how to do it? > > First, make sure that gatt_example plugin was compiled into > bluetoothd. You can check this by looking at the first lines of the > debug log for this string: > > src/plugin.c:add_plugin() Loading gatt_example plugin > > As long as you don't pass any "-P" option to bluetoothd, all compiled > plugins will load by default. > > Next, you can test GATT operations from a remote device, e.g. some > GATT client you already have or the "gatttool" in BlueZ (running on > another adapter). > > Best Regards, > -- > Anderson Lizardo > Instituto Nokia de Tecnologia - INdT > Manaus - Brazil