From f05d1ba7871a2c20ca9ebb303aac89c9296d1f58 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Wed, 26 Apr 2017 13:47:51 -0700 Subject: [PATCH] blk-mq: Only unregister hctxs for which registration succeeded Hctx unregistration involves calling kobject_del(). kobject_del() must not be called if kobject_add() has not been called. Hence in the error path only unregister hctxs for which registration succeeded. Signed-off-by: Bart Van Assche Cc: Omar Sandoval Cc: Hannes Reinecke Signed-off-by: Jens Axboe --- block/blk-mq-sysfs.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index c2cac20..ec0afdf 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -323,16 +323,24 @@ int __blk_mq_register_dev(struct device *dev, struct request_queue *q) queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) - break; + goto unreg; } - if (ret) - __blk_mq_unregister_dev(dev, q); - else - q->mq_sysfs_init_done = true; + q->mq_sysfs_init_done = true; out: return ret; + +unreg: + while (--i >= 0) + blk_mq_unregister_hctx(q->queue_hw_ctx[i]); + + blk_mq_debugfs_unregister_mq(q); + + kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); + kobject_del(&q->mq_kobj); + kobject_put(&dev->kobj); + return ret; } int blk_mq_register_dev(struct device *dev, struct request_queue *q) -- 2.7.4