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nfsd: reduce some spinlocking in put_client_renew 

No need to take the lock unless the count goes to 0.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2014-07-08 14:02:50 -04:00 committed by J. Bruce Fields
parent dff1399f8a
commit d6c249b4d4
1 changed files with 4 additions and 2 deletions
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6
fs/nfsd/nfs4state.c
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@ -193,8 +193,10 @@ static void put_client_renew(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
spin_lock(&nn->client_lock);
put_client_renew_locked(clp);
if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
return;
if (!is_client_expired(clp))
renew_client_locked(clp);
spin_unlock(&nn->client_lock);
}