llist/xen-blkfront: implement safe version of llist_for_each_entry
Implement a safe version of llist_for_each_entry, and use it in blkif_free. Previously grants where freed while iterating the list, which lead to dereferences when trying to fetch the next item. Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NRoger Pau Monné <roger.pau@citrix.com> Acked-by: NAndrew Morton <akpm@linux-foundation.org> [v2: Move the llist_for_each_entry_safe in llist.h] Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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