[PATCH RFC POC 31/50] vfio: install the migration data descriptor when the ioctl returns

[Christian Brauner]

Rely on the fd exit path machinery.

Signed-off-by: Christian Brauner (Amutable) <brauner@xxxxxxxxxx>
---
 drivers/vfio/vfio_main.c | 25 +++++++------------------
 1 file changed, 7 insertions(+), 18 deletions(-)

diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 423ead48aafe..93d9d21f4074 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -903,28 +903,17 @@ EXPORT_SYMBOL_GPL(vfio_mig_get_next_state);
 static int vfio_ioct_mig_return_fd(struct file *filp, void __user *arg,
 				   struct vfio_device_feature_mig_state *mig)
 {
-	int ret;
-	int fd;
+	FD_PREPARE(fdf, O_CLOEXEC, filp);
 
-	fd = get_unused_fd_flags(O_CLOEXEC);
-	if (fd < 0) {
-		ret = fd;
-		goto out_fput;
+	if (IS_ERR(fdf)) {
+		fput(filp);
+		return PTR_ERR(fdf);
 	}
 
-	mig->data_fd = fd;
-	if (copy_to_user(arg, mig, sizeof(*mig))) {
-		ret = -EFAULT;
-		goto out_put_unused;
-	}
-	fd_install(fd, filp);
+	mig->data_fd = fd_prepare_fd(fdf);
+	if (copy_to_user(arg, mig, sizeof(*mig)))
+		return -EFAULT;
 	return 0;
-
-out_put_unused:
-	put_unused_fd(fd);
-out_fput:
-	fput(filp);
-	return ret;
 }
 
 static int

-- 
2.53.0