[prev in list] [next in list] [prev in thread] [next in thread]
List: linux-raid
Subject: [PATCH AUTOSEL 5.19 26/33] md: Flush workqueue md_rdev_misc_wq in md_alloc()
From: Sasha Levin <sashal () kernel ! org>
Date: 2022-08-30 17:18:17
Message-ID: 20220830171825.580603-26-sashal () kernel ! org
[Download RAW message or body]
From: David Sloan <david.sloan@eideticom.com>
[ Upstream commit 5e8daf906f890560df430d30617c692a794acb73 ]
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>
---
drivers/md/md.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 522b3d6b8c46b..3f31db141b2f2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5647,6 +5647,7 @@ static int 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);
--
2.35.1
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic