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SubjectRe: [PATCH v2 1/2] elevator: Fix a race in elevator switching and md device initialization

On Mon, Sep 23, 2013 at 08:11:55PM +0000, Tomoki Sekiyama wrote:
> >Hmm... why aren't we just changing elevator_init() to grab sysfs_lock
> >where necessary?
> The locking cannot be moved into elevator_init() because it is called
> from elevator_switch() path, where the request_queue's sysfs_lock is
> already taken.
> > It'd be more consistent with elevator_exit() that way.
> What elevator_exit() locks is elevator_queue's sysfs_lock, not
> request_queue's sysfs_lock. What we need here is request_queue's
> sysfs_lock.

Ah, okay.

Reviewed-by: Tejun Heo <>



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