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From: Jules Irenge <jbi.octave@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jules Irenge <jbi.octave@gmail.com>,
	boqun.feng@gmail.com, linux-kernel@vger.kernel.org,
	bpf@vger.kernel.org, netdev@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	Jakub Kicinski <kuba@kernel.org>
Subject: Re: [PATCH 2/8] raw: Add missing annotations to raw_seq_start() and raw_seq_stop()
Date: Wed, 11 Mar 2020 01:40:46 +0000 (GMT)	[thread overview]
Message-ID: <alpine.LFD.2.21.2003110138120.3619@ninjahub.org> (raw)
In-Reply-To: <af9016d1-c224-ea61-3290-330ed0fe8d60@gmail.com>



On Tue, 10 Mar 2020, Eric Dumazet wrote:

> 
> 
> On 3/10/20 6:09 PM, Jules Irenge wrote:
> > Sparse reports warnings at raw_seq_start() and raw_seq_stop()
> > 
> > warning: context imbalance in raw_seq_start() - wrong count at exit
> > warning: context imbalance in raw_seq_stop() - unexpected unlock
> > 
> > The root cause is the missing annotations at raw_seq_start()
> > 	and raw_seq_stop()
> > Add the missing __acquires(&h->lock) annotation
> > Add the missing __releases(&h->lock) annotation
> > 
> > Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
> > ---
> >  net/ipv4/raw.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
> > index 3183413ebc6c..47665919048f 100644
> > --- a/net/ipv4/raw.c
> > +++ b/net/ipv4/raw.c
> > @@ -1034,6 +1034,7 @@ static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
> >  }
> >  
> >  void *raw_seq_start(struct seq_file *seq, loff_t *pos)
> > +	__acquires(&h->lock)
> 
> I dunno, h variable is not yet defined/declared at this point,
> this looks weird.
> 
> >  {
> >  	struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
> >  
> > @@ -1056,6 +1057,7 @@ void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
> >  EXPORT_SYMBOL_GPL(raw_seq_next);
> >  
> >  void raw_seq_stop(struct seq_file *seq, void *v)
> > +	__releases(&h->lock)
> >  {
> >  	struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
> >  
> > 
> 
Thanks for the feedback,

I think h is a pointer of type struct raw_hashinfo, in which member lock 
is initialized on line number 89. 

Kind regards

  reply	other threads:[~2020-03-11  1:40 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <0/8>
2020-03-11  1:09 ` [PATCH 0/8] Lock warning cleanups Jules Irenge
2020-03-11  1:09   ` [PATCH 1/8] bpf: Add missing annotations for __bpf_prog_enter() and __bpf_prog_exit() Jules Irenge
2020-03-13 19:49     ` Daniel Borkmann
2020-03-11  1:09   ` [PATCH 2/8] raw: Add missing annotations to raw_seq_start() and raw_seq_stop() Jules Irenge
2020-03-11  1:15     ` Eric Dumazet
2020-03-11  1:40       ` Jules Irenge [this message]
2020-03-12  6:20     ` David Miller
2020-03-11  1:09   ` [PATCH 3/8] tcp: Add missing annotation for tcp_child_process() Jules Irenge
2020-03-11  1:14     ` Eric Dumazet
2020-03-11  1:28       ` Jules Irenge
2020-03-12  6:20     ` David Miller
2020-03-11  1:09   ` [PATCH 4/8] netfilter: Add missing annotation for ctnetlink_parse_nat_setup() Jules Irenge
2020-03-27 17:22     ` Pablo Neira Ayuso
2020-03-11  1:09   ` [PATCH 5/8] netfilter: conntrack: Add missing annotations for nf_conntrack_all_lock() and nf_conntrack_all_unlock() Jules Irenge
2020-03-27 17:22     ` Pablo Neira Ayuso
2020-03-11  1:09   ` [PATCH 6/8] net: Add missing annotation for *netlink_seq_start() Jules Irenge
2020-03-12  6:20     ` David Miller
2020-03-11  1:09   ` [PATCH 7/8] ALSA: firewire-tascam: Add missing annotation for tscm_hwdep_read_queue() Jules Irenge
2020-03-11  3:19     ` Takashi Sakamoto
2020-03-11  6:56     ` Takashi Iwai
2020-03-11  1:09   ` [PATCH 8/8] ALSA: firewire-tascam: Add missing annotation for tscm_hwdep_read_locked() Jules Irenge
2020-03-11  3:18     ` Takashi Sakamoto
2020-03-11  6:56     ` Takashi Iwai

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