md: remove unneeded sysfs files more promptly

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commit b6eb127d27 upstream.

When an array is stopped we need to remove some
sysfs files which are dependent on the type of array.

We need to delay that deletion as deleting them while holding
reconfig_mutex can lead to deadlocks.

We currently delay them until the array is completely destroyed.
However it is possible to deactivate and then reactivate the array.
It is also possible to need to remove sysfs files when changing level,
which can potentially happen several times before an array is
destroyed.

So we need to delete these files more promptly: as soon as
reconfig_mutex is dropped.

We need to ensure this happens before do_md_run can restart the array,
so we use open_mutex for some extra locking.  This is not deadlock
prone.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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NeilBrown 2010-04-15 10:13:47 +10:00 • committed by Greg Kroah-Hartman

parent 784400c5bf

commit 82f2fa7b6f

1 changed files with 31 additions and 10 deletions

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drivers/md/md.c

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