Re: kern/140036: [iwn] [lor] lock order reversal with iwn0_com_lock and iwn0 softc lock

[linimon]

Old Synopsis: lock order reversal with iwn0_com_lock and iwn0 softc lock
New Synopsis: [iwn] [lor] lock order reversal with iwn0_com_lock and iwn0 softc lock

Responsible-Changed-From-To: freebsd-bugs->freebsd-net
Responsible-Changed-By: linimon
Responsible-Changed-When: Wed Oct 28 08:20:57 UTC 2009
Responsible-Changed-Why:
Over to maintainer(s).

http://www.freebsd.org/cgi/query-pr.cgi?pr=140036
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[Bernhard Schmidt-4]

The following reply was made to PR kern/140036; it has been noted by GNATS.

From: Bernhard Schmidt <bschmidt@...>
To: bug-followup@..., kaduk@...
Cc:  
Subject: Re: kern/140036: [iwn] [lor] lock order reversal with iwn0_com_lock and iwn0 softc lock
Date: Thu, 29 Oct 2009 08:19:44 +0100

 Hi,
 
 Removing the IWN_LOCK(sc) leads to races when calling iwn_cmd(). It's better
 to drop the IEEE80211_LOCK(ic). I do have a patch in test which hopefully will
 hit the tree soon.
 
 --
 Bernhard
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[Benjamin Kaduk-2]

The following reply was made to PR kern/140036; it has been noted by GNATS.

From: Benjamin Kaduk <kaduk@...>
To: Bernhard Schmidt <bschmidt@...>
Cc: bug-followup@...
Subject: Re: kern/140036: [iwn] [lor] lock order reversal with iwn0_com_lock
 and iwn0 softc lock
Date: Sat, 31 Oct 2009 19:24:59 -0400 (EDT)

 Indeed, I think I saw a lockup a couple days ago, possibly when
 my card had dissociated and was trying to reassociate.
 
 Thanks for looking into this,
 
 -Ben
 
 On Thu, 29 Oct 2009, Bernhard Schmidt wrote:
 
 > Hi,
 >
 > Removing the IWN_LOCK(sc) leads to races when calling iwn_cmd(). It's better
 > to drop the IEEE80211_LOCK(ic). I do have a patch in test which hopefully will
 > hit the tree soon.
 >
 > --
 > Bernhard
 >
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