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commit 8e04fdfadda75a849c649f7e50fe7d97772e1fcb upstream. mirror->mirror_ds can be NULL if uninitialised, but can contain a PTR_ERR() if call to GETDEVICEINFO failed. Fixes: 65990d1afbd2 ("pNFS/flexfiles: Fix a deadlock on LAYOUTGET") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: stable@vger.kernel.org # 4.10+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>