Comment 2 for bug 1706833

[542.6274] WARNING: CPU: 0 PID: 20729 at /build/linux-MD8jsN/linux-4.4.0/drivers/base/firmware_class.c:1148 _request_firmware+0x7c2/0xaf0()
[542.6276] CPU: 0 PID: 20729 Comm: kworker/u17:0 Tainted: G OE 4.4.0-73-generic #94-Ubuntu
[542.6277] Call Trace:
[542.6277] [<ffffffff813f8493>] dump_stack+0x63/0x90
[542.6277] [<ffffffff81081302>] warn_slowpath_common+0x82/0xc0
[542.6277] [<ffffffff8108144a>] warn_slowpath_null+0x1a/0x20
[542.6277] [<ffffffff81571812>] _request_firmware+0x7c2/0xaf0
[542.6277] [<ffffffff81571b71>] request_firmware+0x31/0x50
[542.6278] [<ffffffffc07a5805>] btusb_setup_qca+0x185/0x3a0 [btusb]
[542.6278] [<ffffffff8156906b>] ? __pm_runtime_resume+0x5b/0x70
[542.6278] [<ffffffffc07a4a49>] btusb_open+0x49/0x250 [btusb]
[542.6278] [<ffffffffc0475cc2>] hci_dev_do_open+0x82/0x580 [bluetooth]
[542.6278] [<ffffffff810ab70d>] ? ttwu_do_activate.constprop.90+0x5d/0x70
[542.6278] [<ffffffffc0477a60>] hci_power_on+0x40/0x1d0 [bluetooth]
[542.6279] [<ffffffff810ecf04>] ? lock_timer_base.isra.22+0x54/0x70
[542.6279] [<ffffffff8109a555>] process_one_work+0x165/0x480
[542.6279] [<ffffffff8109a8bb>] worker_thread+0x4b/0x4c0
[542.6279] [<ffffffff8109a870>] ? process_one_work+0x480/0x480
[542.6279] [<ffffffff810a0be8>] kthread+0xd8/0xf0
[542.6279] [<ffffffff810a0b10>] ? kthread_create_on_node+0x1e0/0x1e0
[542.6279] [<ffffffff8183bd0f>] ret_from_fork+0x3f/0x70
[542.6279] [<ffffffff810a0b10>] ? kthread_create_on_node+0x1e0/0x1e0
[542.6279] ---[ end trace 4e3ab800f10b5115 ]---
[542.6279] bluetooth hci0: firmware: qca/rampatch_usb_00000302.bin will not be loaded
[542.6279] Bluetooth: hci0: failed to request rampatch file: qca/rampatch_usb_00000302.bin (-11)