netdev - [PATCH net-next 1/3] macsec: remove superfluous function calls

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Date:   Sun, 30 Jun 2019 22:46:50 +0200
From:   Andreas Steinmetz <ast@...dv.de>
To:     netdev@...r.kernel.org
Cc:     Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net-next 1/3] macsec: remove superfluous function calls

Remove superfluous skb_share_check() and skb_unshare().
macsec_decrypt is only called by macsec_handle_frame which
already does a skb_unshare().

Signed-off-by: Andreas Steinmetz <ast@...dv.de>

--- a/drivers/net/macsec.c	2019-06-30 22:02:54.906908179 +0200
+++ b/drivers/net/macsec.c	2019-06-30 22:03:07.315785186 +0200
@@ -939,9 +939,6 @@
 	u16 icv_len = secy->icv_len;
 
 	macsec_skb_cb(skb)->valid = false;
-	skb = skb_share_check(skb, GFP_ATOMIC);
-	if (!skb)
-		return ERR_PTR(-ENOMEM);
 
 	ret = skb_cow_data(skb, 0, &trailer);
 	if (unlikely(ret < 0)) {
@@ -973,11 +970,6 @@
 
 		aead_request_set_crypt(req, sg, sg, len, iv);
 		aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
-		skb = skb_unshare(skb, GFP_ATOMIC);
-		if (!skb) {
-			aead_request_free(req);
-			return ERR_PTR(-ENOMEM);
-		}
 	} else {
 		/* integrity only: all headers + data authenticated */
 		aead_request_set_crypt(req, sg, sg, icv_len, iv);