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Remove blkdev warning triggered by using md
As setting and clearing queue flags now requires that we hold a spinlock on the queue, and as blk_queue_stack_limits is called without that lock, get the lock inside blk_queue_stack_limits. For blk_queue_stack_limits to be able to find the right lock, each md personality needs to set q->queue_lock to point to the appropriate lock. Those personalities which didn't previously use a spin_lock, us q->__queue_lock. So always initialise that lock when allocated. With this in place, setting/clearing of the QUEUE_FLAG_PLUGGED bit will no longer cause warnings as it will be clear that the proper lock is held. Thanks to Dan Williams for review and fixing the silly bugs. Signed-off-by: NeilBrown <[email protected]> Cc: Dan Williams <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Alistair John Strachan <[email protected]> Cc: Nick Piggin <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Jacek Luczak <[email protected]> Cc: Prakash Punnoor <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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