Why is my loop not getting past the first line in my file?

Question

script is as follows:

filename="/Users/ra222c/bkdockerhosts"

cat "$filename" | while IFS="" read -r p || [ -n "$p" ]
do
  echo $p
  out=$(ssh "$p" "df -h | awk '/disk-name/ {print \$5}' | sed 's/%//'")
  if [ $out -le 85 ]; then
    echo $p
  fi
done

the file contains about 65 or so hostnames. I'm just trying to check if disk usage is less than 85% across all hosts.