bluetooth related firmware loader spew on resume.

[Dave Jones]

Since the addition of 10d4c6736ea "Bluetooth: btusb: Add Broadcom patch
RAM support", I (and a number of other people[*]) have been seeing
this trace on resume from suspend.

WARNING: CPU: 1 PID: 8565 at drivers/base/firmware_class.c:1127 _request_firmware+0x4c1/0x7c0()
CPU: 1 PID: 8565 Comm: kworker/u17:0 Not tainted 3.17.2-200.fc20.x86_64 #1
Hardware name: LENOVO 2356JK8/2356JK8, BIOS G7ET94WW (2.54 ) 04/30/2013
Workqueue: hci0 hci_power_on [bluetooth]
0000000000000000 00000000f52a564b ffff8800a8c63be8 ffffffff817271cc
0000000000000000 ffff8800a8c63c20 ffffffff81094ced ffff8800a8c63d10
ffff8801365ddf00 ffff8801387b4b00 ffff8800a8c63d08 00000000fffffff5
Call Trace:
[<ffffffff817271cc>] dump_stack+0x45/0x56
[<ffffffff81094ced>] warn_slowpath_common+0x7d/0xa0
[<ffffffff81094e1a>] warn_slowpath_null+0x1a/0x20
[<ffffffff814965c1>] _request_firmware+0x4c1/0x7c0
[<ffffffff8137b9b9>] ? snprintf+0x49/0x70
[<ffffffff814968f1>] request_firmware+0x31/0x50
[<ffffffffa0943bf3>] btusb_setup_bcm_patchram+0x83/0x550 [btusb]
[<ffffffff8148ecf6>] ? rpm_idle+0xd6/0x2b0
[<ffffffffa0649051>] hci_dev_do_open+0xe1/0xa60 [bluetooth]
ACPI: \_SB_.PCI0.LPC_.EC__.BAT1: docking
Restarting tasks ... 
[<ffffffff810bcb3d>] ? ttwu_do_activate.constprop.90+0x5d/0x70
[<ffffffffa064a1c0>] hci_power_on+0x40/0x1e0 [bluetooth]
[<ffffffff810f53fb>] ? lock_timer_base.isra.34+0x2b/0x50
[<ffffffff810acc39>] process_one_work+0x149/0x3d0
[<ffffffff810ad2bb>] worker_thread+0x11b/0x490
[<ffffffff810ad1a0>] ? rescuer_thread+0x2e0/0x2e0
[<ffffffff810b2318>] kthread+0xd8/0xf0
[<ffffffff810b2240>] ? kthread_create_on_node+0x190/0x190
[<ffffffff8172e7bc>] ret_from_fork+0x7c/0xb0
[<ffffffff810b2240>] ? kthread_create_on_node+0x190/0x190
---[ end trace 75a0e9c7f33ebb4c ]---
bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-21e6.hcd will not be loaded
Bluetooth: hci0: BCM: patch brcm/BCM20702A0-0a5c-21e6.hcd not found


At first I thought it was just over-reaction to the file being missing, but
looking at the WARN_ON, it appears that we're trying to invoke the firmware
loader before userspace is back up ?

In this (and probably other related) kernel, CONFIG_FW_LOADER_USER_HELPER is unset,
in case that matters at all.

	Dave

[*] https://bugzilla.kernel.org/show_bug.cgi?id=81821
    https://bugzilla.redhat.com/show_bug.cgi?id=1133378

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