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path: root/drivers/xen/gntdev.c
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Diffstat (limited to 'drivers/xen/gntdev.c')
-rw-r--r--drivers/xen/gntdev.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 57390c7666e5..b0b02a501167 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -492,12 +492,19 @@ static bool in_range(struct gntdev_grant_map *map,
return true;
}
-static void unmap_if_in_range(struct gntdev_grant_map *map,
- unsigned long start, unsigned long end)
+static int unmap_if_in_range(struct gntdev_grant_map *map,
+ unsigned long start, unsigned long end,
+ bool blockable)
{
unsigned long mstart, mend;
int err;
+ if (!in_range(map, start, end))
+ return 0;
+
+ if (!blockable)
+ return -EAGAIN;
+
mstart = max(start, map->vma->vm_start);
mend = min(end, map->vma->vm_end);
pr_debug("map %d+%d (%lx %lx), range %lx %lx, mrange %lx %lx\n",
@@ -508,6 +515,8 @@ static void unmap_if_in_range(struct gntdev_grant_map *map,
(mstart - map->vma->vm_start) >> PAGE_SHIFT,
(mend - mstart) >> PAGE_SHIFT);
WARN_ON(err);
+
+ return 0;
}
static int mn_invl_range_start(struct mmu_notifier *mn,
@@ -519,25 +528,20 @@ static int mn_invl_range_start(struct mmu_notifier *mn,
struct gntdev_grant_map *map;
int ret = 0;
- /* TODO do we really need a mutex here? */
if (blockable)
mutex_lock(&priv->lock);
else if (!mutex_trylock(&priv->lock))
return -EAGAIN;
list_for_each_entry(map, &priv->maps, next) {
- if (in_range(map, start, end)) {
- ret = -EAGAIN;
+ ret = unmap_if_in_range(map, start, end, blockable);
+ if (ret)
goto out_unlock;
- }
- unmap_if_in_range(map, start, end);
}
list_for_each_entry(map, &priv->freeable_maps, next) {
- if (in_range(map, start, end)) {
- ret = -EAGAIN;
+ ret = unmap_if_in_range(map, start, end, blockable);
+ if (ret)
goto out_unlock;
- }
- unmap_if_in_range(map, start, end);
}
out_unlock: