linux-kernel - Re: [Xen-devel] [PATCH] xen/gnttab: leave lazy MMU mode in the case of a m2p override failure

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Message-ID: <CA+aC4ktbsP4zQSP6Urn=25-F4CHWBXSKStis--K-N7wASj4O0A@mail.gmail.com>
Date:	Wed, 20 Nov 2013 13:04:14 -0800
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Matt Wilson <msw@...ux.com>
Cc:	xen-devel@...ts.xenproject.org, Matt Wilson <msw@...zon.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org,
	David Vrabel <david.vrabel@...rix.com>,
	Anthony Liguori <aliguori@...zon.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH] xen/gnttab: leave lazy MMU mode in the case
 of a m2p override failure

On Wed, Nov 20, 2013 at 12:11 PM, Matt Wilson <msw@...ux.com> wrote:
> From: Matt Wilson <msw@...zon.com>
>
> Commit f62805f1 introduced a bug where lazy MMU mode isn't exited if a
> m2p_add/remove_override call fails.
>
> Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: David Vrabel <david.vrabel@...rix.com>
> Cc: Anthony Liguori <aliguori@...zon.com>
> Cc: xen-devel@...ts.xenproject.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Matt Wilson <msw@...zon.com>

Reviewed-by: Anthony Liguori <aliguori@...zon.com>

Regards,

Anthony Liguori

> ---
>  drivers/xen/grant-table.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> index 62ccf54..0283871 100644
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -930,9 +930,10 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
>                 ret = m2p_add_override(mfn, pages[i], kmap_ops ?
>                                        &kmap_ops[i] : NULL);
>                 if (ret)
> -                       return ret;
> +                       goto out;
>         }
>
> + out:
>         if (lazy)
>                 arch_leave_lazy_mmu_mode();
>
> @@ -969,9 +970,10 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
>                 ret = m2p_remove_override(pages[i], kmap_ops ?
>                                        &kmap_ops[i] : NULL);
>                 if (ret)
> -                       return ret;
> +                       goto out;
>         }
>
> + out:
>         if (lazy)
>                 arch_leave_lazy_mmu_mode();
>
> --
> 1.7.9.5
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xen.org
> http://lists.xen.org/xen-devel
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