From 93252632e828da3e90241a1c0e766556abf71598 Mon Sep 17 00:00:00 2001
From: Omar Sandoval <osandov@fb.com>
Date: Wed, 5 Apr 2017 12:01:31 -0700
Subject: blk-mq-sched: set up scheduler tags when bringing up new queues
If a new hardware queue is added at runtime, we don't allocate scheduler
tags for it, leading to a crash. This hooks up the scheduler framework
to blk_mq_{init,exit}_hctx() to make sure everything gets properly
initialized/freed.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---
block/blk-mq-sched.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
(limited to 'block/blk-mq-sched.c')
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 6bd1758ea29b..0bb13bb51daa 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -461,6 +461,28 @@ void blk_mq_sched_teardown(struct request_queue *q)
blk_mq_sched_free_tags(set, hctx, i);
}
+int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
+ unsigned int hctx_idx)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (!e)
+ return 0;
+
+ return blk_mq_sched_alloc_tags(q, hctx, hctx_idx);
+}
+
+void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
+ unsigned int hctx_idx)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (!e)
+ return;
+
+ blk_mq_sched_free_tags(q->tag_set, hctx, hctx_idx);
+}
+
int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e)
{
struct blk_mq_hw_ctx *hctx;
--
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