vringh: fix copy direction of vringh_iov_push_kern()

We want to copy from iov to buf, so the direction was wrong.

Note: no real user for the helper, but it will be used by future
features.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
index 08ad0d1f04766fe10b8a5829628983ec09f0b561..a0a2d74967ef57eb72f73a3bb5367177421ed2d6 100644 (file)
--- a/drivers/vhost/vringh.c
+++ b/drivers/vhost/vringh.c
@@ -852,6 +852,12 @@ static inline int xfer_kern(void *src, void *dst, size_t len)
        return 0;
 }
 
+static inline int kern_xfer(void *dst, void *src, size_t len)
+{
+       memcpy(dst, src, len);
+       return 0;
+}
+
 /**
  * vringh_init_kern - initialize a vringh for a kernelspace vring.
  * @vrh: the vringh to initialize.
@@ -958,7 +964,7 @@ EXPORT_SYMBOL(vringh_iov_pull_kern);
 ssize_t vringh_iov_push_kern(struct vringh_kiov *wiov,
                             const void *src, size_t len)
 {
-       return vringh_iov_xfer(wiov, (void *)src, len, xfer_kern);
+       return vringh_iov_xfer(wiov, (void *)src, len, kern_xfer);
 }
 EXPORT_SYMBOL(vringh_iov_push_kern);