xen/blkfront: correct purging of persistent grants

Commit a46b53672b2c2e3770b38a4abf90d16364d2584b ("xen/blkfront: cleanup
stale persistent grants") introduced a regression as purged persistent
grants were not pu into the list of free grants again. Correct that.

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index a71d817e900d..429d20131c7e 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2670,8 +2670,8 @@ static void purge_persistent_grants(struct blkfront_info *info)
                         list_del(&gnt_list_entry->node);
                         gnttab_end_foreign_access(gnt_list_entry->gref, 0, 0UL);
                         rinfo->persistent_gnts_c--;
-                        __free_page(gnt_list_entry->page);
-                        kfree(gnt_list_entry);
+                        gnt_list_entry->gref = GRANT_INVALID_REF;
+                        list_add_tail(&gnt_list_entry->node, &rinfo->grants);
                 }
 
                 spin_unlock_irqrestore(&rinfo->ring_lock, flags);