linux-kernel - Re: [Xen-devel] [PATCH] xen-blkback: free requests on disconnection

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Date:	Fri, 4 Sep 2015 13:21:22 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Julien Grall <julien.grall@...rix.com>
Cc:	Roger Pau Monne <roger.pau@...rix.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH] xen-blkback: free requests on disconnection

On Fri, Sep 04, 2015 at 02:51:10PM +0100, Julien Grall wrote:
> Hi Roger,
> 
> On 04/09/15 11:08, Roger Pau Monne wrote:
> > Request allocation has been moved to connect_ring, which is called every
> > time blkback connects to the frontend (this can happen multiple times during
> > a blkback instance life cycle). On the other hand, request freeing has not
> > been moved, so it's only called when destroying the backend instance. Due to
> > this mismatch, blkback can allocate the request pool multiple times, without
> > freeing it.
> > 
> > In order to fix it, move the freeing of requests to xen_blkif_disconnect to
> > restore the symmetry between request allocation and freeing.
> > 
> > Reported-by: Julien Grall <julien.grall@...rix.com>
> > Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
> > Cc: Julien Grall <julien.grall@...rix.com>
> > Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> > Cc: David Vrabel <david.vrabel@...rix.com>
> > Cc: xen-devel@...ts.xenproject.org
> 
> The patch is fixing my problem when using UEFI in the guest. Thank you!
> 
> Tested-by: Julien Grall <julien.grall@...rix.com>

Testing it now for regressions and should be sending an git pull next week
for it.

Thanks!
> 
> Regards,
> 
> -- 
> Julien Grall
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xen.org
> http://lists.xen.org/xen-devel
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