Remove obsolete zv_lock

All users of zv_lock were removed by 37f9dac, but we forgot to remove
it.  Lets remove it as clean up.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #3858

diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
index c81f02a3907b9fc77644e8eb34427c09d58b0ac0..cdaa838d23e49b782e709c7fdf563a9d562e35a8 100644 (file)
--- a/module/zfs/zvol.c
+++ b/module/zfs/zvol.c
@@ -74,7 +74,6 @@ typedef struct zvol_state {
        dev_t                   zv_dev;         /* device id */
        struct gendisk          *zv_disk;       /* generic disk */
        struct request_queue    *zv_queue;      /* request queue */
-       spinlock_t              zv_lock;        /* request queue lock */
        list_node_t             zv_next;        /* next zvol_state_t linkage */
 } zvol_state_t;
 
@@ -1205,7 +1204,6 @@ zvol_alloc(dev_t dev, const char *name)
 
        zv = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
 
-       spin_lock_init(&zv->zv_lock);
        list_link_init(&zv->zv_next);
 
        zv->zv_queue = blk_alloc_queue(GFP_ATOMIC);