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authorDaniel De Graaf <dgdegra@tycho.nsa.gov>2011-02-09 23:11:59 +0300
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-02-14 22:16:20 +0300
commit84e4075d60fc8f1c0b937765620bc784dd0c3d39 (patch)
tree1d337c56f68d0e1a7ca9db3749dcaead46b35ba3 /drivers/xen/gntdev.c
parent0ea22f072fb1b3da4307573c280ce904f0bf1589 (diff)
downloadlinux-84e4075d60fc8f1c0b937765620bc784dd0c3d39.tar.xz
xen-gntdev: Use map->vma for checking map validity
The is_mapped flag used to be set at the completion of the map operation, but was not checked in all error paths. Use map->vma instead, which will now be cleared if the initial grant mapping fails. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/gntdev.c')
-rw-r--r--drivers/xen/gntdev.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 75f8037c9833..4ca4262d3d19 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -77,7 +77,6 @@ struct grant_map {
int index;
int count;
int flags;
- int is_mapped;
atomic_t users;
struct unmap_notify notify;
struct ioctl_gntdev_grant_ref *grants;
@@ -322,7 +321,6 @@ static void gntdev_vma_close(struct vm_area_struct *vma)
struct grant_map *map = vma->vm_private_data;
pr_debug("close %p\n", vma);
- map->is_mapped = 0;
map->vma = NULL;
vma->vm_private_data = NULL;
gntdev_put_map(map);
@@ -347,8 +345,6 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
list_for_each_entry(map, &priv->maps, next) {
if (!map->vma)
continue;
- if (!map->is_mapped)
- continue;
if (map->vma->vm_start >= end)
continue;
if (map->vma->vm_end <= start)
@@ -663,8 +659,6 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
if (err)
goto out_put_map;
- map->is_mapped = 1;
-
if (!use_ptemod) {
for (i = 0; i < count; i++) {
err = vm_insert_page(vma, vma->vm_start + i*PAGE_SIZE,
@@ -681,6 +675,8 @@ unlock_out:
return err;
out_put_map:
+ if (use_ptemod)
+ map->vma = NULL;
gntdev_put_map(map);
return err;
}