Comment 3 for bug 856314

I believe I'm experiencing the same issue. When it occurs, if I try pinging a remote machine I get the following message:

ping: sendmsg: No buffer space available

Hardware info:

01:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)
 Subsystem: AzureWave Device 2047
 Flags: bus master, fast devsel, latency 0, IRQ 16
 Memory at fea00000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: <access denied>
 Kernel driver in use: brcmsmac
 Kernel modules: bcma, brcmsmac

This issue was not present in the 11.04 kernels, even when used with the compat wireless releases of brcmsmac.