[Qemu-devel] [PATCH] tap: make set_offload a nop after netdev cleanup

[Michael S. Tsirkin]

virtio-net expects set_offload to succeed after
peer cleanup.
Since we don't have an open fd anymore, make it so.
Fixes warning about the failure of offload setting.

Reported-by: Jason Wang <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
 net/tap.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/tap.c b/net/tap.c
index 4cfa538..51c762d 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -248,6 +248,9 @@ void tap_set_offload(VLANClientState *nc, int csum, int 
tso4,
                      int tso6, int ecn, int ufo)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
+    if (s->fd < 0) {
+        return 0;
+    }
 
     return tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
 }
@@ -269,6 +272,7 @@ static void tap_cleanup(VLANClientState *nc)
     tap_read_poll(s, 0);
     tap_write_poll(s, 0);
     close(s->fd);
+    s->fd = -1;
 }
 
 static void tap_poll(VLANClientState *nc, bool enable)
-- 
1.7.3.2.91.g446ac