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

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Message-Id: <1384978295-18292-1-git-send-email-msw@linux.com>
Date:	Wed, 20 Nov 2013 12:11:35 -0800
From:	Matt Wilson <msw@...ux.com>
To:	xen-devel@...ts.xenproject.org
Cc:	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: [PATCH] xen/gnttab: leave lazy MMU mode in the case of a m2p override failure

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>
---
 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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