netdev - Re: [PATCH net-next 1/2] ieee802154: sparse warnings: make symbols static

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Date:	Mon, 02 Jul 2012 08:49:11 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Smirnov <alex.bluesman.smirnov@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, dbaryshkov@...il.com
Subject: Re: [PATCH net-next 1/2] ieee802154: sparse warnings: make symbols
 static

On Mon, 2012-07-02 at 08:44 +0200, Eric Dumazet wrote:
> On Mon, 2012-07-02 at 08:37 +0200, Eric Dumazet wrote:
> > On Mon, 2012-07-02 at 10:18 +0400, Alexander Smirnov wrote:
> > > Make symbols static to avoid the following warning shown up
> > > by sparse:
> > > 
> > >     warning: symbol ... was not declared. Should it be static?
> > > 
> > > Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@...il.com>
> > > ---
> > >  net/ieee802154/6lowpan.c |    2 +-
> > >  net/mac802154/mac_cmd.c  |    2 +-
> > >  net/mac802154/mib.c      |    2 +-
> > >  3 files changed, 3 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
> > > index cd5007f..17ad28f 100644
> > > --- a/net/ieee802154/6lowpan.c
> > > +++ b/net/ieee802154/6lowpan.c
> > > @@ -124,7 +124,7 @@ struct lowpan_fragment {
> > >  
> > >  static unsigned short fragment_tag;
> > >  static LIST_HEAD(lowpan_fragments);
> > > -spinlock_t flist_lock;
> > > +static spinlock_t flist_lock;
> > >  
> > 
> > static DEFINE_SPINLOCK(flist_lock);
> 
> 
> and of course commit 768f7c7c121e80f4 (6lowpan: add missing
> spin_lock_init() ) must be reverted.

You should validate this code with LOCKDEP

lowpan_dellink() does a spin_lock(&flist_lock);
while same lock can be taken by lowpan_fragment_timer_expired() from
timer irq, -> deadlock.

del_timer() probably needs a del_timer_sync() too



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