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| author | Ming Lei <tom.leiming@gmail.com> | 2017-02-22 18:13:59 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-08 09:56:12 -0700 |
| commit | 737f98cfe7de8df7433a4d846850aa8efa44bd48 (patch) | |
| tree | 6a3c10de93ed79a32271b9cd5d354bd6e3999d29 /block/blk-mq.h | |
| parent | ec3b93ae0bf4742e9cbb40e1964129926c1464e0 (diff) | |
| download | lwn-737f98cfe7de8df7433a4d846850aa8efa44bd48.tar.gz lwn-737f98cfe7de8df7433a4d846850aa8efa44bd48.zip | |
blk-mq: initialize mq kobjects in blk_mq_init_allocated_queue()
Both q->mq_kobj and sw queues' kobjects should have been initialized
once, instead of doing that each add_disk context.
Also this patch removes clearing of ctx in blk_mq_init_cpu_queues()
because percpu allocator fills zero to allocated variable.
This patch fixes one issue[1] reported from Omar.
[1] kernel wearning when doing unbind/bind on one scsi-mq device
[ 19.347924] kobject (ffff8800791ea0b8): tried to init an initialized object, something is seriously wrong.
[ 19.349781] CPU: 1 PID: 84 Comm: kworker/u8:1 Not tainted 4.10.0-rc7-00210-g53f39eeaa263 #34
[ 19.350686] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.1-20161122_114906-anatol 04/01/2014
[ 19.350920] Workqueue: events_unbound async_run_entry_fn
[ 19.350920] Call Trace:
[ 19.350920] dump_stack+0x63/0x83
[ 19.350920] kobject_init+0x77/0x90
[ 19.350920] blk_mq_register_dev+0x40/0x130
[ 19.350920] blk_register_queue+0xb6/0x190
[ 19.350920] device_add_disk+0x1ec/0x4b0
[ 19.350920] sd_probe_async+0x10d/0x1c0 [sd_mod]
[ 19.350920] async_run_entry_fn+0x48/0x150
[ 19.350920] process_one_work+0x1d0/0x480
[ 19.350920] worker_thread+0x48/0x4e0
[ 19.350920] kthread+0x101/0x140
[ 19.350920] ? process_one_work+0x480/0x480
[ 19.350920] ? kthread_create_on_node+0x60/0x60
[ 19.350920] ret_from_fork+0x2c/0x40
Cc: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq.h')
| -rw-r--r-- | block/blk-mq.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index 088ced003c13..ad8bfd7473ef 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -77,6 +77,7 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, /* * sysfs helpers */ +extern void blk_mq_sysfs_init(struct request_queue *q); extern int blk_mq_sysfs_register(struct request_queue *q); extern void blk_mq_sysfs_unregister(struct request_queue *q); extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); |