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md: Flush workqueue md_rdev_misc_wq in md_alloc()

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A race condition still exists when removing and re-creating md devices
in test cases. However, it is only seen on some setups.

The race condition was tracked down to a reference still being held
to the kobject by the rdev in the md_rdev_misc_wq which will be released
in rdev_delayed_delete().

md_alloc() waits for previous deletions by waiting on the md_misc_wq,
but the md_rdev_misc_wq may still be holding a reference to a recently
removed device.

To fix this, also flush the md_rdev_misc_wq in md_alloc().

Signed-off-by: David Sloan <david.sloan@eideticom.com>
[logang@deltatee.com: rewrote commit message]
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
David Sloan 2022-08-11 11:14:13 -06:00 committed by Song Liu
parent 265ad47a40
commit 5e8daf906f
1 changed files with 1 additions and 0 deletions
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drivers/md/md.c
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@ -5620,6 +5620,7 @@ struct mddev *md_alloc(dev_t dev, char *name)
* removed (mddev_delayed_delete).
*/
flush_workqueue(md_misc_wq);
flush_workqueue(md_rdev_misc_wq);
mutex_lock(&disks_mutex);
mddev = mddev_alloc(dev);