Is the usb driver in 0.2.2 release stable enough to be used?

Several day ago, I had problem to use prism2_usb driver in 2.4.3x kernel,
but it keep crash linux kernel when doing hotplug, so I gave up, and I
decided to move to 2.6 kernel, Luckly, it doesn't crash my new-installed
RHFC 3 system, but when do hotplug, I always get these message.

[root@localhost init.d]# hfa384x_usbctlx_complete_sync: CTLX[5] error:
state(Request failed)
hfa384x_drvr_readpda: Read from index 0 failed, continuing
hfa384x_usbctlx_complete_sync: CTLX[5] error: state(Request failed)
hfa384x_drvr_readpda: Read from index 1 failed, continuing
hfa384x_drvr_readpda: pdrlen invalid=1026
prism2mgmt_readpda: hfa384x_drvr_readpda() failed, result=-61
hfa384x_usbctlx_complete_sync: CTLX[4] error: state(Request failed)
hfa384x_usbctlx_complete_sync: CTLX[4] error: state(Request failed)
hfa384x_usbctlx_complete_sync: CTLX[4] error: state(Request failed)
hfa384x_usbctlx_complete_sync: CTLX[1] error: state(Request failed)
hfa384x_usbctlx_complete_sync: CTLX[5] error: state(Request failed)
hfa384x_drvr_readpda: Read from index 0 failed, continuing
hfa384x_usbctlx_complete_sync: CTLX[5] error: state(Request failed)
hfa384x_drvr_readpda: Read from index 1 failed, continuing
hfa384x_usbctlx_complete_sync: CTLX[5] error: state(Request failed)
hfa384x_drvr_readpda: Read from index 2 failed, continuing
prism2mgmt_readpda: hfa384x_drvr_readpda() failed, result=-61


The sequence I did is:
bootup RHFC3,
plug in USB wireless card, and found p80211.o & prism2_usb.o are loaded
/etc/init.d/wlan start
/sbin/ifconfig wlan0 10.0.39.1
ping 10.0.39.241
everything OK
unplug USB card
wait several seconds
plug in USB card

If I do " ifconfig wlan0 down && /etc/init.d/wlan stop" before I unplug USB
card, I will see the two modules are removed, and when I plug in it back, I
have this:
[root@localhost init.d]# prism2usb_init: prism2_usb.o: 0.2.2 Loaded
prism2usb_init: dev_info is: prism2_usb
< following withe all the error message from above >