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NFSv4: Add lockdep checks to nfs4_wait_clnt_recover()

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Attempt to detect deadlocks due to caller holding locks on clp->cl_sem

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-12-13 16:43:13 -05:00
parent a6a352e93d
commit e148582e10
1 changed files with 4 additions and 0 deletions
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4
fs/nfs/nfs4proc.c
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@ -2711,11 +2711,15 @@ static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
might_sleep();
rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
rpc_clnt_sigmask(clnt, &oldset);
res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
nfs4_wait_bit_interruptible,
TASK_INTERRUPTIBLE);
rpc_clnt_sigunmask(clnt, &oldset);
rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
return res;
}