linux-kernel - [PATCH] cxgb4: unnecessary check for 0 in the free_sge_txq

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Date: Wed, 13 Mar 2024 11:34:36 -0400
From: Mikhail Lobanov <m.lobanov@...alinux.ru>
To: Raju Rangoju <rajur@...lsio.com>
Cc: Mikhail Lobanov <m.lobanov@...alinux.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	netdev@...r.kernel.org (open list:CXGB4 ETHERNET DRIVER (CXGB4)),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] cxgb4: unnecessary check for 0 in the free_sge_txq_uld() function

The free_sge_txq_old() function has an unnecessary txq check of 0.
This check is not necessary, since the txq pointer is initialized by the
uldtxq[i] address from the operation &txq_info->uldtxq[i], which ensures
that txq is not equal to 0.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: ab677ff4ad15 ("cxgb4: Allocate Tx queues dynamically")
Signed-off-by: Mikhail Lobanov <m.lobanov@...alinux.ru>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
index 17faac715882..5c13bcb4550d 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
@@ -406,7 +406,7 @@ free_sge_txq_uld(struct adapter *adap, struct sge_uld_txq_info *txq_info)
 	for (i = 0; i < nq; i++) {
 		struct sge_uld_txq *txq = &txq_info->uldtxq[i];
 
-		if (txq && txq->q.desc) {
+		if (txq->q.desc) {
 			tasklet_kill(&txq->qresume_tsk);
 			t4_ofld_eq_free(adap, adap->mbox, adap->pf, 0,
 					txq->q.cntxt_id);
-- 
2.43.0