urtwn(4) Random freezes, urtwn_getbuf: out of xmit buffers

[Kevin Lo]

On Tue, Oct 28, 2014 at 12:41:15PM -0700, Sean Bruno wrote:
> 
> It looks like recent HEAD seems to fail intermittently here on my home
> network.  It will recover, but urtwn(4) seems to lose an ack or
> something on txmit.  turning on debug, yields this message during the
> hang event.
> 
> hw.usb.urtwn.debug: 1
> 
> Oct 28 12:34:58 bruno kernel: _urtwn_getbuf: _urtwn_getbuf: out of xmit
> buffers
> Oct 28 12:34:58 bruno kernel: urtwn_getbuf: urtwn_getbuf: stop queue
> Oct 28 12:34:58 bruno kernel: _urtwn_getbuf: _urtwn_getbuf: out of xmit
> buffers
> Oct 28 12:34:58 bruno kernel: urtwn_getbuf: urtwn_getbuf: stop queue
> 
> Additionally, I get the following at module load time:
> 
> urtwn0: <vendor 0x0bda product 0x8176, class 0/0, rev 2.00/2.00, addr 1>
> on usbus0
> urtwn0: could not read efuse byte at address 0x10
> urtwn0: could not read efuse byte at address 0x18

Strange.  What the wlan dongle model do you use?  I have the RTL8188CUS 
wireless usb adaptor (Edimax EW-7811Un), but I cannot reproduce that issue.

	Kevin