linux-kernel - [PATCH 5/8] net: sun4i-emac: fix error return code

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Message-Id: <1419872683-32709-6-git-send-email-Julia.Lawall@lip6.fr>
Date:	Mon, 29 Dec 2014 18:04:40 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	kernel-janitors@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/8] net: sun4i-emac: fix error return code

Return a negative error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/net/ethernet/allwinner/sun4i-emac.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 1fcd556..cfdf7de 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -850,8 +850,10 @@ static int emac_probe(struct platform_device *pdev)
 	}
 
 	db->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(db->clk))
+	if (IS_ERR(db->clk)) {
+		ret = PTR_ERR(db->clk);
 		goto out;
+	}
 
 	clk_prepare_enable(db->clk);
 

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