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authorZhen Lei <thunder.leizhen@huawei.com>2015-03-16 14:08:56 -0600
committerAlex Williamson <alex.williamson@redhat.com>2015-03-16 14:08:56 -0600
commit2f51bf4be99386f49841b6365a85a5cabc148565 (patch)
tree2c3c9d7c36d2a3b14b577b4f0a09b0df34d11a6b /drivers/vfio
parenta7fa7c77cf15fb22d0f33fcc88770de0246c5588 (diff)
downloadop-kernel-dev-2f51bf4be99386f49841b6365a85a5cabc148565.zip
op-kernel-dev-2f51bf4be99386f49841b6365a85a5cabc148565.tar.gz
vfio: put off the allocation of "minor" in vfio_create_group
The next code fragment "list_for_each_entry" is not depend on "minor". With this patch, the free of "minor" in "list_for_each_entry" can be reduced, and there is no functional change. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 23ba12a..86aac7e 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -234,22 +234,21 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
mutex_lock(&vfio.group_lock);
- minor = vfio_alloc_group_minor(group);
- if (minor < 0) {
- vfio_group_unlock_and_free(group);
- return ERR_PTR(minor);
- }
-
/* Did we race creating this group? */
list_for_each_entry(tmp, &vfio.group_list, vfio_next) {
if (tmp->iommu_group == iommu_group) {
vfio_group_get(tmp);
- vfio_free_group_minor(minor);
vfio_group_unlock_and_free(group);
return tmp;
}
}
+ minor = vfio_alloc_group_minor(group);
+ if (minor < 0) {
+ vfio_group_unlock_and_free(group);
+ return ERR_PTR(minor);
+ }
+
dev = device_create(vfio.class, NULL,
MKDEV(MAJOR(vfio.group_devt), minor),
group, "%d", iommu_group_id(iommu_group));
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