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

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Date:	Thu, 21 Nov 2013 18:39:19 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Matt Wilson <msw@...ux.com>
CC:	<xen-devel@...ts.xenproject.org>, Matt Wilson <msw@...zon.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Anthony Liguori <aliguori@...zon.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xen/gnttab: leave lazy MMU mode in the case of a m2p
 override failure

On Wed, 20 Nov 2013, Matt Wilson 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>

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>


>  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
> 
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