linux-kernel - [PATCH 2/4] mfd: twl6040: fix error return code

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Date:	Wed,  6 Aug 2014 22:12:15 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	kernel-janitors@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] mfd: twl6040: fix error return code

From: Julia Lawall <Julia.Lawall@...6.fr>

Convert a zero return value on error to a negative one, as returned
elsewhere in the function.

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

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 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/mfd/twl6040.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mfd/twl6040.c b/drivers/mfd/twl6040.c
index f9c06c5..9687645 100644
--- a/drivers/mfd/twl6040.c
+++ b/drivers/mfd/twl6040.c
@@ -679,6 +679,7 @@ static int twl6040_probe(struct i2c_client *client,
 	if (twl6040->rev < 0) {
 		dev_err(&client->dev, "Failed to read revision register: %d\n",
 			twl6040->rev);
+		ret = twl6040->rev;
 		goto gpio_err;
 	}
 

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