Revert "xen/blkfront: When purging persistent grants, keep them in the buffer"

Fix didn't work for all cases, reverting to add a (hopefully)
better fix.

This reverts commit f151ba989d149bbdfc90e5405724bbea094f9b17.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 3b441fe69c0d..a71d817e900d 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2667,9 +2667,11 @@ static void purge_persistent_grants(struct blkfront_info *info)
                             gnttab_query_foreign_access(gnt_list_entry->gref))
                                 continue;
 
+                        list_del(&gnt_list_entry->node);
                         gnttab_end_foreign_access(gnt_list_entry->gref, 0, 0UL);
-                        gnt_list_entry->gref = GRANT_INVALID_REF;
                         rinfo->persistent_gnts_c--;
+                        __free_page(gnt_list_entry->page);
+                        kfree(gnt_list_entry);
                 }
 
                 spin_unlock_irqrestore(&rinfo->ring_lock, flags);