linux-kernel - [PATCH 3.5 031/103] xen/gnttab: leave lazy MMU mode in the case of a m2p override failure

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Message-Id: <1387304012-23805-32-git-send-email-luis.henriques@canonical.com>
Date:	Tue, 17 Dec 2013 18:12:20 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	xen-devel@...ts.xenproject.org, Matt Wilson <msw@...zon.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.5 031/103] xen/gnttab: leave lazy MMU mode in the case of a m2p override failure

3.5.7.28 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matt Wilson <msw@...zon.com>

commit 14883a75ec76b44759385fb12629f4a0f1aef4e3 upstream.

Commit f62805f1 introduced a bug where lazy MMU mode isn't exited if a
m2p_add/remove_override call fails.

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Reviewed-by: David Vrabel <david.vrabel@...rix.com>
Reviewed-by: 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>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.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 8a6ecc5..93cb98e 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -867,9 +867,10 @@ 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();
 
@@ -900,9 +901,10 @@ 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();
 
-- 
1.8.3.2

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