linux-kernel - [PATCH 9/14] drivers/spi/spi-omap-100k.c: fix error return code

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Date:	Sun, 19 Aug 2012 10:44:28 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	kernel-janitors@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH 9/14] drivers/spi/spi-omap-100k.c: fix error return code

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

Initialize return variable before exiting on an error path.

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>

---
Actually, omap1_spi100k_reset currently always returns 0, so the test is
never true.  Perhaps this should be taken into account in some other way.

 drivers/spi/spi-omap-100k.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-omap-100k.c b/drivers/spi/spi-omap-100k.c
index 9bd1c92..b581107 100644
--- a/drivers/spi/spi-omap-100k.c
+++ b/drivers/spi/spi-omap-100k.c
@@ -542,7 +542,8 @@ static int __devinit omap1_spi100k_probe(struct platform_device *pdev)
 		goto err2;
 	}
 
-	if (omap1_spi100k_reset(spi100k) < 0)
+	status = omap1_spi100k_reset(spi100k);
+	if (status < 0)
 		goto err3;
 
 	status = spi_register_master(master);

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