md: remove need for mddev_lock() in md_seq_show()

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The only access in md_seq_show that could suffer from races
not protected by ->lock is walking the rdev list.
This can receive sufficient protection from 'rcu'.

So use rdev_for_each_rcu() and get rid of mddev_lock().

Now reading /proc/mdstat will never block in md_seq_show.

Signed-off-by: NeilBrown <neilb@suse.de>

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NeilBrown 2014-12-15 12:56:59 +11:00

parent 978a7a47ca

commit f97fcad38f

1 changed files with 3 additions and 5 deletions

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drivers/md/md.c

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