xen-blkback: init persistent_purge_work work_struct

Initialize persistent_purge_work work_struct on xen_blkif_alloc (and
remove the previous initialization done in purge_persistent_gnt). This
prevents flush_work from complaining even if purge_persistent_gnt has
not been used.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Tested-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 765fc73..64c60ed 100644 (file)
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -299,7 +299,7 @@ static void free_persistent_gnts(struct xen_blkif *blkif, struct rb_root *root,
        BUG_ON(num != 0);
 }
 
-static void unmap_purged_grants(struct work_struct *work)
+void xen_blkbk_unmap_purged_grants(struct work_struct *work)
 {
        struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
        struct page *pages[BLKIF_MAX_SEGMENTS_PER_REQUEST];
@@ -420,7 +420,6 @@ finished:
        blkif->vbd.overflow_max_grants = 0;
 
        /* We can defer this work */
-       INIT_WORK(&blkif->persistent_purge_work, unmap_purged_grants);
        schedule_work(&blkif->persistent_purge_work);
        pr_debug(DRV_PFX "Purged %u/%u\n", (total - num_clean), total);
        return;

diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 9eb34e2..be05277 100644 (file)
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -385,6 +385,7 @@ int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
 int xen_blkbk_barrier(struct xenbus_transaction xbt,
                      struct backend_info *be, int state);
 struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be);
+void xen_blkbk_unmap_purged_grants(struct work_struct *work);
 
 static inline void blkif_get_x86_32_req(struct blkif_request *dst,
                                        struct blkif_x86_32_request *src)

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 84973c6..9a547e6 100644 (file)
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -129,6 +129,7 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
        blkif->free_pages_num = 0;
        atomic_set(&blkif->persistent_gnt_in_use, 0);
        atomic_set(&blkif->inflight, 0);
+       INIT_WORK(&blkif->persistent_purge_work, xen_blkbk_unmap_purged_grants);
 
        INIT_LIST_HEAD(&blkif->pending_free);