xen/blkback: remove unused pers_gnts_lock from struct xen_blkif_ring

pers_gnts_lock isn't being used anywhere. Remove it.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 2339b8d..1d3002d 100644 (file)
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -269,7 +269,6 @@ struct xen_blkif_ring {
        wait_queue_head_t       pending_free_wq;
 
        /* Tree to store persistent grants. */
-       spinlock_t              pers_gnts_lock;
        struct rb_root          persistent_gnts;
        unsigned int            persistent_gnt_c;
        atomic_t                persistent_gnt_in_use;