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From:   Kangjie Lu <kjlu@umn.edu>
To:     kjlu@umn.edu
Cc:     pakki001@umn.edu, Xue Liu <liuxuenetmail@gmail.com>,
        Alexander Aring <alex.aring@gmail.com>,
        Stefan Schmidt <stefan@datenfreihafen.org>,
        "David S. Miller" <davem@davemloft.net>,
        linux-wpan@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH] net: ieee802154: fix missing checks for regmap_update_bits
Date:   Sun, 24 Mar 2019 18:18:56 -0500
Message-Id: <20190324231856.2664-1-kjlu@umn.edu>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

regmap_update_bits could fail and deserves a check.

The patch adds the checks and if it fails, returns its error
code upstream.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
 drivers/net/ieee802154/mcr20a.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ieee802154/mcr20a.c b/drivers/net/ieee802154/mcr20a.c
index c589f5ae75bb..8bb53ec8d9cf 100644
--- a/drivers/net/ieee802154/mcr20a.c
+++ b/drivers/net/ieee802154/mcr20a.c
@@ -533,6 +533,8 @@ mcr20a_start(struct ieee802154_hw *hw)
 	dev_dbg(printdev(lp), "no slotted operation\n");
 	ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
 				 DAR_PHY_CTRL1_SLOTTED, 0x0);
+	if (ret < 0)
+		return ret;
 
 	/* enable irq */
 	enable_irq(lp->spi->irq);
@@ -540,11 +542,15 @@ mcr20a_start(struct ieee802154_hw *hw)
 	/* Unmask SEQ interrupt */
 	ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL2,
 				 DAR_PHY_CTRL2_SEQMSK, 0x0);
+	if (ret < 0)
+		return ret;
 
 	/* Start the RX sequence */
 	dev_dbg(printdev(lp), "start the RX sequence\n");
 	ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
 				 DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_RX);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }
-- 
2.17.1