tree ce2a134fdbed539f535f1b5a63cd5bdbc264965b
parent 7a308bb3016f57e5be11a677d15b821536419d36
author Trond Myklebust <trond.myklebust@primarydata.com> 1485229452 -0500
committer Trond Myklebust <trond.myklebust@primarydata.com> 1485229452 -0500

NFSv4.1: Fix a deadlock in layoutget

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>