Thread (31 messages) 31 messages, 3 authors, 2022-08-19
STALE1404d

[RFC PATCH v3 3/9] virtio/vsock: use 'target' in notify_poll_in callback

From: Arseniy Krasnov <hidden>
Date: 2022-08-03 13:57:08
Also in: kvm, linux-hyperv, lkml
Subsystem: networking [general], the rest, virtio and vhost vsock driver, virtio core, vm sockets (af_vsock) · Maintainers: "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Stefan Hajnoczi, Stefano Garzarella, "Michael S. Tsirkin", Jason Wang

This callback controls setting of POLLIN,POLLRDNORM output bits of poll()
syscall,but in some cases,it is incorrectly to set it, when socket has
at least 1 bytes of available data. Use 'target' which is already exists
and equal to sk_rcvlowat in this case.

Signed-off-by: Arseniy Krasnov <redacted>
---
 net/vmw_vsock/virtio_transport_common.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index ec2c2afbf0d0..8f6356ebcdd1 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -634,10 +634,7 @@ virtio_transport_notify_poll_in(struct vsock_sock *vsk,
 				size_t target,
 				bool *data_ready_now)
 {
-	if (vsock_stream_has_data(vsk))
-		*data_ready_now = true;
-	else
-		*data_ready_now = false;
+	*data_ready_now = vsock_stream_has_data(vsk) >= target;
 
 	return 0;
 }
-- 
2.25.1
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