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H A Dblk-mq-sysfs.cdiff 737f98cfe7de8df7433a4d846850aa8efa44bd48 Wed Feb 22 04:13:59 CST 2017 Ming Lei <tom.leiming@gmail.com> 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>
H A Dblk-mq.hdiff 737f98cfe7de8df7433a4d846850aa8efa44bd48 Wed Feb 22 04:13:59 CST 2017 Ming Lei <tom.leiming@gmail.com> 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>
H A Dblk-mq.cdiff 737f98cfe7de8df7433a4d846850aa8efa44bd48 Wed Feb 22 04:13:59 CST 2017 Ming Lei <tom.leiming@gmail.com> 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>