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NFSv4.1: Fix a deadlock in layoutget

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We cannot call nfs4_handle_exception() without first ensuring that the
slot has been freed. If not, we end up deadlocking with the process
waiting for recovery to complete, and recovery waiting for the slot
table to drain.

Fixes: 2e80dbe7ac51 ("NFSv4.1: Close callback races for OPEN, LAYOUTGET...")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-01-23 22:44:12 -05:00
parent 7a308bb301
commit 8ac092519a
1 changed files with 1 additions and 0 deletions
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fs/nfs/nfs4proc.c
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@ -8490,6 +8490,7 @@ nfs4_layoutget_handle_exception(struct rpc_task *task,
goto out;
}
nfs4_sequence_free_slot(&lgp->res.seq_res);
err = nfs4_handle_exception(server, nfs4err, exception);
if (!status) {
if (exception->retry)