netdev - [PATCH v2] fsl_ucc_hdlc: add a check of the return value from hdlc

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Date: Mon, 28 Aug 2023 11:27:03 +0300
From: Alexandra Diupina <adiupina@...ralinux.ru>
To: Zhao Qiang <qiang.zhao@....com>
Cc: Alexandra Diupina <adiupina@...ralinux.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH v2] fsl_ucc_hdlc: add a check of the return value from hdlc_open

Process the result of hold_open() and return it from
uhdlc_open() in case of an error
It is necessary to pass the error code up the control flow,
similar to a possible error in request_irq()

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

Fixes: c19b6d246a35 ("drivers/net: support hdlc function for QE-UCC")
Signed-off-by: Alexandra Diupina <adiupina@...ralinux.ru>
---
v2: Remove the 'rc' variable (stores the return value of the 
hdlc_open()) as Christophe Leroy <christophe.leroy@...roup.eu> suggested
 drivers/net/wan/fsl_ucc_hdlc.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index cdd9489c712e..4164abea7725 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -708,7 +708,6 @@ static int uhdlc_open(struct net_device *dev)
 	hdlc_device *hdlc = dev_to_hdlc(dev);
 	struct ucc_hdlc_private *priv = hdlc->priv;
 	struct ucc_tdm *utdm = priv->utdm;
-	int rc = 0;
 
 	if (priv->hdlc_busy != 1) {
 		if (request_irq(priv->ut_info->uf_info.irq,
@@ -732,12 +731,10 @@ static int uhdlc_open(struct net_device *dev)
 		napi_enable(&priv->napi);
 		netdev_reset_queue(dev);
 		netif_start_queue(dev);
-		rc = hdlc_open(dev);
-		if (rc)
-			return rc;
+		return hdlc_open(dev);
 	}
 
-	return rc;
+	return 0;
 }
 
 static void uhdlc_memclean(struct ucc_hdlc_private *priv)
-- 
2.30.2