netdev - [PATCH 3/3] net: mediatek: check device

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Message-Id: <1457964435-2945038-3-git-send-email-arnd@arndb.de>
Date:	Mon, 14 Mar 2016 15:07:12 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Arnd Bergmann <arnd@...db.de>, Felix Fietkau <nbd@...nwrt.org>,
	John Crispin <blogic@...nwrt.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] net: mediatek: check device_reset return code

The device_reset() function may fail, so we have to check
its return value, e.g. to make deferred probing work correctly.
gcc warns about it because of the warn_unused_result attribute:

drivers/net/ethernet/mediatek/mtk_eth_soc.c: In function 'mtk_probe':
drivers/net/ethernet/mediatek/mtk_eth_soc.c:1679:2: error: ignoring return value of 'device_reset', declared with attribute warn_unused_result [-Werror=unused-result]

This adds the trivial error check to propagate the return value
to the generic platform device probe code.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 87f417712da0..1e6c5498bba9 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1676,7 +1676,9 @@ static int mtk_probe(struct platform_device *pdev)
 	struct mtk_eth *eth;
 	int err;
 
-	device_reset(&pdev->dev);
+	err = device_reset(&pdev->dev);
+	if (err)
+		return err;
 
 	match = of_match_device(of_mtk_match, &pdev->dev);
 	soc = (struct mtk_soc_data *)match->data;
-- 
2.7.0