aboutsummaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2016-09-23 10:25:48 -0600
committerJens Axboe <axboe@fb.com>2016-09-23 10:25:48 -0600
commitc8712c6a674e3382fe4d26d108251ccfa55d08e0 (patch)
tree0448232c6dc785440ade5f5ee5e648d9fc56d996 /block
parent3b4ac78610690bd83fb33762ef97e8b8a89285ae (diff)
downloadlinux-stericsson-c8712c6a674e3382fe4d26d108251ccfa55d08e0.tar.gz
blk-mq: skip unmapped queues in blk_mq_alloc_request_hctx
This provides the caller a feedback that a given hctx is not mapped and thus no command can be sent on it. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 13f5a6c1de76..c207fa9870eb 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -296,17 +296,29 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
if (ret)
return ERR_PTR(ret);
+ /*
+ * Check if the hardware context is actually mapped to anything.
+ * If not tell the caller that it should skip this queue.
+ */
hctx = q->queue_hw_ctx[hctx_idx];
+ if (!blk_mq_hw_queue_mapped(hctx)) {
+ ret = -EXDEV;
+ goto out_queue_exit;
+ }
ctx = __blk_mq_get_ctx(q, cpumask_first(hctx->cpumask));
blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
rq = __blk_mq_alloc_request(&alloc_data, rw, 0);
if (!rq) {
- blk_queue_exit(q);
- return ERR_PTR(-EWOULDBLOCK);
+ ret = -EWOULDBLOCK;
+ goto out_queue_exit;
}
return rq;
+
+out_queue_exit:
+ blk_queue_exit(q);
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);