linux-kernel - Re: [ 12/37] block: fix request

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Date:	Mon, 22 Oct 2012 08:36:06 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, alan@...rguk.ukuu.org.uk,
	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [ 12/37] block: fix request_queue->flags initialization

On Sun, Oct 21, 2012 at 11:56:18AM -0700, Tejun Heo wrote:
> Hello, Greg.
> 
> On Sun, Oct 21, 2012 at 09:25:29AM -0700, Greg Kroah-Hartman wrote:
> > > > commit 60ea8226cbd5c8301f9a39edc574ddabcb8150e0 upstream.
> > > > 
> > > > A queue newly allocated with blk_alloc_queue_node() has only
> > > > QUEUE_FLAG_BYPASS set.  For request-based drivers,
> > > > blk_init_allocated_queue() is called and q->queue_flags is overwritten
> > > > with QUEUE_FLAG_DEFAULT which doesn't include BYPASS even though the
> > > > initial bypass is still in effect.
> > > > 
> > > > In blk_init_allocated_queue(), or QUEUE_FLAG_DEFAULT to q->queue_flags
> > > > instead of overwriting.
> > > [...]
> > > 
> > > This is not needed, as there is no QUEUE_FLAG_BYPASS in 3.0.y.
> > 
> > Odd, it doesn't break the build.  And for some reason I just missed
> > this, does it hurt to have it applied?
> 
> I don't think it will break anything as it simply changes assignment
> to |= to avoid overwriting existing flags.  That said, any patch can
> break anything, so if possible it would be better to drop for 3.0.y.

Ok, I'll revert this and push out a 3.0.48 to be safe.

thanks,

greg k-h
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