BUG: sleeping function called from invalid context

[Holger Schurig]

> What I don't know is why something is calling
> get_wireless_stats() when setting the essid. This happens way
> before a call into lbs_set_essid() (the WEXT handler), as can
> be seen from the log below.

Okay, that question has now an answer: an strace of iwconfig 
(wireless-tools 29~pre22-1~bpo40+1) does 
open /proc/net/wireless, which in turn calls 
lbs_get_wireless_stats().

This happens before the SIOCSIWESSID ioctl().