From: Zhen Lei Date: Mon, 16 Mar 2015 20:08:56 +0000 (-0600) Subject: vfio: put off the allocation of "minor" in vfio_create_group X-Git-Tag: v4.1-rc1~134^2~9 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2f51bf4be99386f49841b6365a85a5cabc148565;p=karo-tx-linux.git 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 Signed-off-by: Alex Williamson --- diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 23ba12afe01f..86aac7e4a050 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));