Re: [PULL REQUEST] md bug fixes and minor improvements

[Jens Axboe <jens.axboe@oracle.com>]

On Fri, Aug 01 2008, Linus Torvalds wrote:
> 
> 
> On Fri, 1 Aug 2008, Jens Axboe wrote:
> > +			spin_lock_irq(&bitmap->mddev->queue->queue_lock);
> >  			blk_plug_device(bitmap->mddev->queue);
> > +			spin_unlock_irq(&bitmap->mddev->queue->queue_lock);
> 
> Can we please not have a chain of three dereferences in a row like that? 
> That's an almost certain sign that we should either have a helper function 
> or just a variable, and do it as
> 
> 	queue = bitmap->mddev->queue;
> 
> 	spin_lock_irq(&queue->queue_lock);
> 	blk_plug_device(queue);
> 	spin_unlock_irq(&queue->queue_lock);
> 
> Hmm? Perhaps the helper function is cleaner, ie
> 
> 	static inline blk_plug_device_unlocked(struct request_queue * queue)
> 	{..
> 
> instead. That, of course, would have to use spin_lock_irqsave().

I rather like that. I've got a few simpler things to push, I'll queue it
up with that and send you a pull request later today.

-- 
Jens Axboe