gfs2: Fix "Introduce flag for glock holder auto-demotion"
Function demote_incompat_holders iterates over the list of glock holders with list_for_each_entry, and it then sometimes removes the current holder from the list. This will get the loop stuck; we must use list_for_each_entry_safe instead. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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