Re: [PATCH] ceph: delete unnecessary mutex lock/unlock

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> On 15 Mar 2018, at 02:55, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
> 
> On Wed, Mar 14, 2018 at 1:14 AM Yan, Zheng <ukernel@xxxxxxxxx> wrote:
> On Tue, Mar 13, 2018 at 7:52 PM, Chengguang Xu <cgxu519@xxxxxxx> wrote:
> > Obviously wrong mutex lock/unlock for nothing.
> >
> > Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
> > ---
> >  fs/ceph/mds_client.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
> > index 8fc37a8..5439dfd 100644
> > --- a/fs/ceph/mds_client.c
> > +++ b/fs/ceph/mds_client.c
> > @@ -3514,8 +3514,6 @@ static void drop_leases(struct ceph_mds_client *mdsc)
> >                 if (!s)
> >                         continue;
> >                 mutex_unlock(&mdsc->mutex);
> > -               mutex_lock(&s->s_mutex);
> > -               mutex_unlock(&s->s_mutex);
> >                 ceph_put_mds_session(s);
> >                 mutex_lock(&mdsc->mutex);
> >         }
> > --
> > 1.8.3.1
> >
> Applied, thanks
> Yan, Zheng
> 
> So I'm sure it's not the case, but when I saw this go by I was assuming that the mutex grab is to make sure we don't have anybody still running in a critical section that assumes those caps are held. Is that not an issue and/or definitely not the case? :)
> -Greg

I think you are right. Thanks

Yan, Zheng


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