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authorTrond Myklebust <trond.myklebust@primarydata.com>2017-01-24 06:44:12 +0300
committerTrond Myklebust <trond.myklebust@primarydata.com>2017-01-24 06:44:12 +0300
commit8ac092519ad91931c96d306c4bfae2c6587c325f (patch)
treece2a134fdbed539f535f1b5a63cd5bdbc264965b /fs
parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
downloadlinux-8ac092519ad91931c96d306c4bfae2c6587c325f.tar.xz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/nfs4proc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ecc151697fd4..59bb574d7d7c 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -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)