blk-mq: allow the hctx cpu hotplug notifier to return errors

Prepare this for the next patch which adds more smarts in the
plugging logic, so that we can save some memory.

Signed-off-by: Jens Axboe <axboe@fb.com>

4 files changed, 15 insertions, 10 deletions

diff --git a/block/blk-mq-cpu.c b/block/blk-mq-cpu.c
index 136ef8643bba..d2c253f71b86 100644
--- a/block/blk-mq-cpu.c
+++ b/block/blk-mq-cpu.c
@@ -18,14 +18,18 @@ static int blk_mq_main_cpu_notify(struct notifier_block *self,
 {
 	unsigned int cpu = (unsigned long) hcpu;
 	struct blk_mq_cpu_notifier *notify;
+	int ret = NOTIFY_OK;
 
 	raw_spin_lock(&blk_mq_cpu_notify_lock);
 
-	list_for_each_entry(notify, &blk_mq_cpu_notify_list, list)
-		notify->notify(notify->data, action, cpu);
+	list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) {
+		ret = notify->notify(notify->data, action, cpu);
+		if (ret != NOTIFY_OK)
+			break;
+	}
 
 	raw_spin_unlock(&blk_mq_cpu_notify_lock);
-	return NOTIFY_OK;
+	return ret;
 }
 
 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
@@ -45,7 +49,7 @@ void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
 }
 
 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
-			      void (*fn)(void *, unsigned long, unsigned int),
+			      int (*fn)(void *, unsigned long, unsigned int),
 			      void *data)
 {
 	notifier->notify = fn;
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ef7ed5e95d6d..5a3683fc5bdb 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1196,8 +1196,8 @@ void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *hctx,
 }
 EXPORT_SYMBOL(blk_mq_free_single_hw_queue);
 
-static void blk_mq_hctx_notify(void *data, unsigned long action,
-			       unsigned int cpu)
+static int blk_mq_hctx_notify(void *data, unsigned long action,
+			      unsigned int cpu)
 {
 	struct blk_mq_hw_ctx *hctx = data;
 	struct request_queue *q = hctx->queue;
@@ -1205,7 +1205,7 @@ static void blk_mq_hctx_notify(void *data, unsigned long action,
 	LIST_HEAD(tmp);
 
 	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
-		return;
+		return NOTIFY_OK;
 
 	/*
 	 * Move ctx entries to new CPU, if this one is going away.
@@ -1220,7 +1220,7 @@ static void blk_mq_hctx_notify(void *data, unsigned long action,
 	spin_unlock(&ctx->lock);
 
 	if (list_empty(&tmp))
-		return;
+		return NOTIFY_OK;
 
 	ctx = blk_mq_get_ctx(q);
 	spin_lock(&ctx->lock);
@@ -1240,6 +1240,7 @@ static void blk_mq_hctx_notify(void *data, unsigned long action,
 
 	blk_mq_run_hw_queue(hctx, true);
 	blk_mq_put_ctx(ctx);
+	return NOTIFY_OK;
 }
 
 static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 7db4fe4bd002..491dbd4e93f5 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -39,7 +39,7 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
  */
 struct blk_mq_cpu_notifier;
 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
-			      void (*fn)(void *, unsigned long, unsigned int),
+			      int (*fn)(void *, unsigned long, unsigned int),
 			      void *data);
 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index f45424453338..4d2800567aad 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -8,7 +8,7 @@ struct blk_mq_tags;
 struct blk_mq_cpu_notifier {
 	struct list_head list;
 	void *data;
-	void (*notify)(void *data, unsigned long action, unsigned int cpu);
+	int (*notify)(void *data, unsigned long action, unsigned int cpu);
 };
 
 struct blk_mq_ctxmap {