netdev - [PATCH] xen-netback: use local var in xenvif_tx_check

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Date:   Thu, 25 Feb 2021 16:39:01 +0100
From:   Jan Beulich <jbeulich@...e.com>
To:     Wei Liu <wl@....org>, Paul Durrant <paul@....org>
Cc:     "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH] xen-netback: use local var in xenvif_tx_check_gop() instead
 of re-calculating

shinfo already holds the result of skb_shinfo(skb) at this point - no
need to re-invoke the construct even twice.

Signed-off-by: Jan Beulich <jbeulich@...e.com>

--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -557,8 +557,8 @@ check_frags:
 	}
 
 	if (skb_has_frag_list(skb) && !first_shinfo) {
-		first_shinfo = skb_shinfo(skb);
-		shinfo = skb_shinfo(skb_shinfo(skb)->frag_list);
+		first_shinfo = shinfo;
+		shinfo = skb_shinfo(shinfo->frag_list);
 		nr_frags = shinfo->nr_frags;
 
 		goto check_frags;