linux-kernel - [PATCH] scsi: cxgbi: remove redundant __kfree

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Message-Id: <20190409133819.21127-1-colin.king@canonical.com>
Date:   Tue,  9 Apr 2019 14:38:19 +0100
From:   Colin King <colin.king@...onical.com>
To:     Karen Xie <kxie@...lsio.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: cxgbi: remove redundant __kfree_skb call on skb

From: Colin Ian King <colin.king@...onical.com>

The error return path via label rel_resource checks for a non-null
skb before free'ing it.  However, skb is always null at this exit
path, so the null check and the free are redundant and can be removed.
Removing this allows the original goto's to rel_resource to be cleaned
up; the first can be replaced by a return of -EINVAL, the second can
be replaced by a more appropriate -ENOMEM return since allow_wr has
failed go allocate some memory.

Addresses-Coverity: ("Logically Dead Code")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/scsi/cxgbi/cxgb3i/cxgb3i.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c
index 75e1273a44b3..5a4387f437d5 100644
--- a/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c
+++ b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c
@@ -979,14 +979,14 @@ static int init_act_open(struct cxgbi_sock *csk)
 	csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
 	if (csk->atid < 0) {
 		pr_err("NO atid available.\n");
-		goto rel_resource;
+		return -EINVAL;
 	}
 	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
 	cxgbi_sock_get(csk);
 
 	skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
 	if (!skb)
-		goto rel_resource;
+		return -ENOMEM;
 	skb->sk = (struct sock *)csk;
 	set_arp_failure_handler(skb, act_open_arp_failure);
 	csk->snd_win = cxgb3i_snd_win;
@@ -1007,11 +1007,6 @@ static int init_act_open(struct cxgbi_sock *csk)
 	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
 	send_act_open_req(csk, skb, csk->l2t);
 	return 0;
-
-rel_resource:
-	if (skb)
-		__kfree_skb(skb);
-	return -EINVAL;
 }
 
 cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
-- 
2.20.1