[Xen-changelog] [linux-2.6.18-xen] netfront: make req_prod check properly deal with index wraps

[Xen patchbot-linux-2.6.18-xen <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1525335399 -7200
#      Thu May 03 10:16:39 2018 +0200
# Node ID bd81621b04afff0f403d1701970d12ebf05eccb1
# Parent  f8a110b3f989066e9b987739323c427a030efd45
netfront: make req_prod check properly deal with index wraps

Using > on bare ring indexes is always wrong, as this will fail when the
indexes wrap. Since the private req_prod_pvt is never behind the shared
req_prod, simply use != here.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r f8a110b3f989 -r bd81621b04af drivers/xen/netfront/netfront.c
--- a/drivers/xen/netfront/netfront.c   Thu May 03 10:15:19 2018 +0200
+++ b/drivers/xen/netfront/netfront.c   Thu May 03 10:16:39 2018 +0200
@@ -775,7 +775,7 @@ no_skb:
 
        /* Is the batch large enough to be worthwhile? */
        if (i < (np->rx_target/2)) {
-               if (req_prod > np->rx.sring->req_prod)
+               if (req_prod != np->rx.sring->req_prod)
                        goto push;
                return;
        }

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