dm stripe: switch from local workqueue to system_wq

kstriped only serves sc->kstriped_ws which runs dm_table_event().
This doesn't need to be executed from an ordered workqueue w/ rescuer.
Drop kstriped and use the system_wq instead.  While at it, rename
kstriped_ws to trigger_event so that it's consistent with other dm
modules.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 7 insertions, 20 deletions

diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index f0371b4c4fbf..dddfa14f2982 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -39,23 +39,20 @@ struct stripe_c {
         struct dm_target *ti;
 
         /* Work struct used for triggering events*/
-        struct work_struct kstriped_ws;
+        struct work_struct trigger_event;
 
         struct stripe stripe[0];
 };
 
-static struct workqueue_struct *kstriped;
-
 /*
  * An event is triggered whenever a drive
  * drops out of a stripe volume.
  */
 static void trigger_event(struct work_struct *work)
 {
-        struct stripe_c *sc = container_of(work, struct stripe_c, kstriped_ws);
-
+        struct stripe_c *sc = container_of(work, struct stripe_c,
+                                           trigger_event);
         dm_table_event(sc->ti->table);
-
 }
 
 static inline struct stripe_c *alloc_context(unsigned int stripes)
@@ -160,7 +157,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                 return -ENOMEM;
         }
 
-        INIT_WORK(&sc->kstriped_ws, trigger_event);
+        INIT_WORK(&sc->trigger_event, trigger_event);
 
         /* Set pointer to dm target; used in trigger_event */
         sc->ti = ti;
@@ -211,7 +208,7 @@ static void stripe_dtr(struct dm_target *ti)
         for (i = 0; i < sc->stripes; i++)
                 dm_put_device(ti, sc->stripe[i].dev);
 
-        flush_workqueue(kstriped);
+        flush_work_sync(&sc->trigger_event);
         kfree(sc);
 }
 
@@ -367,7 +364,7 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio,
                         atomic_inc(&(sc->stripe[i].error_count));
                         if (atomic_read(&(sc->stripe[i].error_count)) <
                             DM_IO_ERROR_THRESHOLD)
-                                queue_work(kstriped, &sc->kstriped_ws);
+                                schedule_work(&sc->trigger_event);
                 }
 
         return error;
@@ -401,7 +398,7 @@ static void stripe_io_hints(struct dm_target *ti,
 
 static struct target_type stripe_target = {
         .name   = "striped",
-        .version = {1, 3, 0},
+        .version = {1, 3, 1},
         .module = THIS_MODULE,
         .ctr    = stripe_ctr,
         .dtr    = stripe_dtr,
@@ -422,20 +419,10 @@ int __init dm_stripe_init(void)
                 return r;
         }
 
-        kstriped = create_singlethread_workqueue("kstriped");
-        if (!kstriped) {
-                DMERR("failed to create workqueue kstriped");
-                dm_unregister_target(&stripe_target);
-                return -ENOMEM;
-        }
-
         return r;
 }
 
 void dm_stripe_exit(void)
 {
         dm_unregister_target(&stripe_target);
-        destroy_workqueue(kstriped);
-
-        return;
 }