kernel panic during boot with ath9k_htc wifi device

During boot I see this in the journal( syslog):

Apr 02 11:57:22 boiler-bone.mydomain.com kernel: ieee80211 phy0: Atheros AR9271 Rev:1
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: Adding interface wlan0 [ wifi ]
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {update} flags 36931 <UP,RUNNING>
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {newlink} index 4 address C4:E9:84:0E:00:00 mtu 1500
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {newlink} index 4 operstate 0
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {update} flags 36867
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {newlink} index 4 address C4:E9:84:0E:00:00 mtu 1500
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {newlink} index 4 operstate 2
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {newlink} index 4 address C4:E9:84:0E:00:00 mtu 1500
Apr 02 11:57:22 boiler-bone.mydomain.com connmand[372]: wlan0 {newlink} index 4 operstate 2
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: ------------[ cut here ]------------
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: WARNING: CPU: 0 PID: 494 at drivers/base/devres.c:888 bone_pinmux_helper_probe+0x151/0x1
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: Modules linked in: arc4 ath9k_htc ath9k_common ath9k_hw ath mac80211 cfg80211 omap_sham
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: CPU: 0 PID: 494 Comm: bash Not tainted 4.5.0-bone3 #1
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: Hardware name: Generic AM33XX (Flattened Device Tree)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (unwind_backtrace) from [] (show_stack+0x11/0x14)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (show_stack) from [] (warn_slowpath_common+0x6b/0x8c)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (warn_slowpath_common) from [] (warn_slowpath_null+0x17/0x1c)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (warn_slowpath_null) from [] (bone_pinmux_helper_probe+0x151/0x1c
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (bone_pinmux_helper_probe) from [] (platform_drv_probe+0x37/0x7c)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (platform_drv_probe) from [] (driver_probe_device+0xc5/0x310)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (driver_probe_device) from [] (bus_for_each_drv+0x51/0x80)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (bus_for_each_drv) from [] (__device_attach+0x83/0xe8)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (__device_attach) from [] (bus_probe_device+0x5b/0x60)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (bus_probe_device) from [] (device_add+0x303/0x430)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (device_add) from [] (of_platform_device_create_pdata+0x69/0x94)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (of_platform_device_create_pdata) from [] (of_platform_notify+0x8
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (of_platform_notify) from [] (notifier_call_chain+0x4b/0x68)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (notifier_call_chain) from [] (__blocking_notifier_call_chain+0x2
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (_blocking_notifier_call_chain) from [] (blocking_notifier_call
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (blocking_notifier_call_chain) from [] (__of_changeset_entry_noti

Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (__of_changeset_entry_notify) from [] (__of_changeset_apply+0x65/
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (__of_changeset_apply) from [] (__of_overlay_create+0x2ed/0x46c)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (__of_overlay_create) from [] (capemgr_load_slot+0x2e9/0x464)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (capemgr_load_slot) from [] (slots_store+0xf1/0x244)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (slots_store) from [] (kernfs_fop_write+0x85/0x150)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (kernfs_fop_write) from [] (__vfs_write+0x29/0xa4)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (__vfs_write) from [] (vfs_write+0x65/0x12c)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (vfs_write) from [] (SyS_write+0x3f/0x80)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: [] (SyS_write) from [] (ret_fast_syscall+0x1/0x4c)
Apr 02 11:57:22 boiler-bone.mydomain.com kernel: —[ end trace 476f0f719918ffb8 ]—

This happened on my 4.1 and then now on the upgraded 4.5.0-bone3.
This appears several times, in the syslog, yet the wifi works well.

http://www.gossamer-threads.com/lists/linux/kernel/2337544
[lkp] [i2c] 3489746df0: WARNING: CPU: 0 PID: 1 at drivers/base/devres.c:888 devm_kfree+0x61/0x76()