usb_submit_urb errors

Have any of you ever seen this?  It happens when I try to do an ifconfig
wlan0 with an IP address.

/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: open: submit_rx_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
/root/at76c503a/at76c503.c: wlan0: giving up to submit rx urb after 8
failures - please unload the driver and/or power cycle the device


It LOOKS like my driver is up:

~ # iwconfig wlan0
wlan0     IEEE 802.11-DS  ESSID:"Wireless"  Nickname:"Jeep"
          Mode:Managed  Channel:7  Access Point: 00:00:00:00:00:00
          Bit Rate:11Mb/s   Tx-Power=15 dBm
          Retry limit:8   RTS thr=2346 B   Fragment thr:off
          Encryption key:XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XX   Security
mode:restricted
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0


but it never sees any packets.  The green light blinks when there is other
activity on the wlan.