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UPSTREAM: VSOCK: Only check error on skb_recv_datagram when skb is NULL

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If skb_recv_datagram returns an skb, we should ignore the err
value returned. Otherwise, datagram receives will return EAGAIN
when they have to wait for a datagram.

Acked-by: Adit Ranadive <aditr@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 9c995cc9a2)
Bug: 121166534
Test: Ran cuttlefish with android-4.4 + VSOCKETS, VMWARE_VMCI_VSOCKETS
Signed-off-by: Cody Schuffelen <schuffelen@google.com>
Change-Id: I69d487529656cb2fe8be9c2cef0db440d4db5cac
This commit is contained in:
Jorgen Hansen
2016-04-18 23:58:52 -07:00
committed by Alistair Strachan
parent 4c63405330
commit 7103ea77d3
1 changed files with 2 additions and 5 deletions
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7
net/vmw_vsock/vmci_transport.c
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@@ -1767,11 +1767,8 @@ static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk,
/* Retrieve the head sk_buff from the socket's receive queue. */
err = 0;
skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
if (err)
return err;
if (!skb)
return -EAGAIN;
return err;
dg = (struct vmci_datagram *)skb->data;
if (!dg)
@@ -2186,7 +2183,7 @@ module_exit(vmci_transport_exit);
MODULE_AUTHOR("VMware, Inc.");
MODULE_DESCRIPTION("VMCI transport for Virtual Sockets");
MODULE_VERSION("1.0.3.0-k");
MODULE_VERSION("1.0.4.0-k");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("vmware_vsock");
MODULE_ALIAS_NETPROTO(PF_VSOCK);