svn commit: r206419 - head/sys/net80211

[Rui Paulo]

On 11 Apr 2010, at 23:44, Sam Leffler wrote:

> Rui Paulo wrote:
>> Author: rpaulo
>> Date: Fri Apr  9 12:06:19 2010
>> New Revision: 206419
>> URL: http://svn.freebsd.org/changeset/base/206419
>> Log:
>>  Use M_NOWAIT instead of M_WAITOK to avoid race conditions.
>>  
> 
> Can you describe these race conditions (or at least one of them)?

Some drivers call ratectl functions with locks held. I saw similar allocations in the net80211 stack that used M_NOWAIT and printed an error if the allocation failed, but didn't notify the caller (for example ieee80211_node_table_init()).

If I use M_WAITOK here I'll also get WITNESS warnings.

Regards,
--
Rui Paulo