[PATCH v2 22/22] vfio: Remove the get_region_info op

[Jason Gunthorpe]

No driver uses it now, all are using get_region_info_caps().

Reviewed-by: Kevin Tian <kevin.t...@intel.com>
Signed-off-by: Jason Gunthorpe <j...@nvidia.com>
---
 drivers/vfio/vfio_main.c | 48 ++++++++++++++++++----------------------
 include/linux/vfio.h     |  2 --
 2 files changed, 21 insertions(+), 29 deletions(-)

diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 48d034aede46fc..b8fe1a75e48a0b 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -1267,42 +1267,36 @@ static long vfio_get_region_info(struct vfio_device 
*device,
        struct vfio_info_cap caps = {};
        int ret;
 
+       if (unlikely(!device->ops->get_region_info_caps))
+               return -EINVAL;
+
        if (copy_from_user(&info, arg, minsz))
                return -EFAULT;
        if (info.argsz < minsz)
                return -EINVAL;
 
-       if (device->ops->get_region_info_caps) {
-               ret = device->ops->get_region_info_caps(device, &info, &caps);
-               if (ret)
-                       goto out_free;
+       ret = device->ops->get_region_info_caps(device, &info, &caps);
+       if (ret)
+               goto out_free;
 
-               if (caps.size) {
-                       info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
-                       if (info.argsz < sizeof(info) + caps.size) {
-                               info.argsz = sizeof(info) + caps.size;
-                               info.cap_offset = 0;
-                       } else {
-                               vfio_info_cap_shift(&caps, sizeof(info));
-                               if (copy_to_user(arg + 1, caps.buf,
-                                                caps.size)) {
-                                       ret = -EFAULT;
-                                       goto out_free;
-                               }
-                               info.cap_offset = sizeof(info);
+       if (caps.size) {
+               info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
+               if (info.argsz < sizeof(info) + caps.size) {
+                       info.argsz = sizeof(info) + caps.size;
+                       info.cap_offset = 0;
+               } else {
+                       vfio_info_cap_shift(&caps, sizeof(info));
+                       if (copy_to_user(arg + 1, caps.buf, caps.size)) {
+                               ret = -EFAULT;
+                               goto out_free;
                        }
+                       info.cap_offset = sizeof(info);
                }
+       }
 
-               if (copy_to_user(arg, &info, minsz)) {
-                       ret = -EFAULT;
-                       goto out_free;
-               }
-       } else if (device->ops->get_region_info) {
-               ret = device->ops->get_region_info(device, arg);
-               if (ret)
-                       return ret;
-       } else {
-               return -EINVAL;
+       if (copy_to_user(arg, &info, minsz)){
+               ret = -EFAULT;
+               goto out_free;
        }
 
 out_free:
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 6311ddc837701d..8e1ddb48b9b54e 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -133,8 +133,6 @@ struct vfio_device_ops {
                         size_t count, loff_t *size);
        long    (*ioctl)(struct vfio_device *vdev, unsigned int cmd,
                         unsigned long arg);
-       int     (*get_region_info)(struct vfio_device *vdev,
-                                  struct vfio_region_info __user *arg);
        int     (*get_region_info_caps)(struct vfio_device *vdev,
                                        struct vfio_region_info *info,
                                        struct vfio_info_cap *caps);
-- 
2.43.0