https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249402
Bug ID: 249402
Summary: Locking issue when requesting an ieee80211 scan
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: wireless
Assignee: [email protected]
Reporter: [email protected]
Created attachment 218029
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218029&action=edit
Patch to unlock the wifi ic before calling ieee80211_check_scan()
While adapting the ieee80211 stack to NetBSD I ran into a locking issue
whenever scans are started.
I don't know if locking the wifi IC in FreeBSD allows for recursion - in NetBSD
it doesn't and all scan starts will result in a "locking against myself"
assertion with LOCKDEBUG kernels.
The call here comes in via the ic_newstate callback, which always is called
with IC locked (see also the assertion a few lines above), but the
ieee80211_check_scan() function (and indirectly ieee80211_check_scan_current()
which calls it) will lock the ic again.
Simple patch to work around attached.
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