md: Flush workqueue md_rdev_misc_wq in md_alloc()

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[ Upstream commit 5e8daf906f ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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David Sloan 2022-08-11 11:14:13 -06:00 • committed by Greg Kroah-Hartman

parent a62701db41

commit cebda5e536

1 changed files with 1 additions and 0 deletions

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drivers/md/md.c

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