From: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>
Date: Mon, 3 Sep 2018 20:59:13 +0300
Subject: vhost: fix VHOST_GET_BACKEND_FEATURES ioctl request definition
Patch-mainline: v4.19-rc3
Git-commit: c48300c92ad9f029f4dcbcf5d71ad880e3acf2fa
References: bsc#1109837

The _IOC_READ flag fits this ioctl request more because this request
actually only writes to, but doesn't read from userspace.
See NOTEs in include/uapi/asm-generic/ioctl.h for more information.

Fixes: 429711aec282 ("vhost: switch to use new message format")
Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/uapi/linux/vhost.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -175,7 +175,7 @@ struct vhost_memory {
 #define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1
 
 #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
-#define VHOST_GET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x26, __u64)
+#define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
 
 /* VHOST_NET specific defines */