iwn driver issue

Hi,

Im running FreeBSD current:
FreeBSD nereid 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r265628: Thu May  8 08:05:37 UTC 2014     
root_at_grind.freebsd.org:/usr/obj/usr/src/sys/VT  amd64

on Asus Zenbook UX32VD. My wireless network works ok, however from time to time I need
to restart the netif service since my link does not work anymore. After restart everything is ok.
The device is: Wifi: Intel Centrino Advanced-N 6235.

Sometimes Im able to see something like:

iwn0: iwn_scan: called whilst scanning!
iwn0: iwn_intr: fatal firmware error
firmware error log:
  error type      = "UNKNOWN" (0x0000198A)
  program counter = 0x00015920
  source line     = 0x000001DC
  error data      = 0x0000029600000000
  branch link     = 0x0001591000015910
  interrupt link  = 0x0000DBEA00000000
  time            = 2479833477
driver status:
  tx ring  0: qid=0  cur=14  queued=0  
  tx ring  1: qid=1  cur=0   queued=0  
  tx ring  2: qid=2  cur=0   queued=0  
  tx ring  3: qid=3  cur=19  queued=0  
  tx ring  4: qid=4  cur=0   queued=0  
  tx ring  5: qid=5  cur=0   queued=0  
  tx ring  6: qid=6  cur=0   queued=0  
  tx ring  7: qid=7  cur=0   queued=0  
  tx ring  8: qid=8  cur=0   queued=0  
  tx ring  9: qid=9  cur=1   queued=0  
  tx ring 10: qid=10 cur=0   queued=0  
  tx ring 11: qid=11 cur=0   queued=0  
  tx ring 12: qid=12 cur=0   queued=0  
  tx ring 13: qid=13 cur=0   queued=0  
  tx ring 14: qid=14 cur=0   queued=0  
  tx ring 15: qid=15 cur=0   queued=0  
  tx ring 16: qid=16 cur=0   queued=0  
  tx ring 17: qid=17 cur=0   queued=0  
  tx ring 18: qid=18 cur=0   queued=0  
  tx ring 19: qid=19 cur=0   queued=0  
  rx ring: cur=24

After restarting the networking service everything is back to normal.

ifa_del_loopback_route: deletion failed: 3
wlan0: link state changed to DOWN
wlan0: Ethernet address: c4:85:08:a3:4e:09
wlan0: link state changed to UP

Is iwn firmware the issue here, or a bug in iwn driver ?

Thanks,

-- 
Stefan Parvu <sparvu_at_systemdatarecorder.org>