linux-kernel - [PATCH 4/8] drivers/i2c/busses/i2c-pasemi.c: Fix unsigned return type

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Date:	Sun,  5 Sep 2010 21:00:22 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Olof Johansson <olof@...om.net>
Cc:	kernel-janitors@...r.kernel.org,
	"Jean Delvare (PC drivers, core)" <khali@...ux-fr.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	linux-i2c@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/8] drivers/i2c/busses/i2c-pasemi.c: Fix unsigned return type

The function has an unsigned return type, but returns a negative constant
to indicate an error condition.  The result of calling the function is
always stored in a variable of type (signed) int, and thus unsigned can be
dropped from the return type.

A sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@exists@
identifier f;
constant C;
@@

 unsigned f(...)
 { <+...
*  return -C;
 ...+> }
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/i2c/busses/i2c-pasemi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-pasemi.c b/drivers/i2c/busses/i2c-pasemi.c
index 4174101..837b8c1 100644
--- a/drivers/i2c/busses/i2c-pasemi.c
+++ b/drivers/i2c/busses/i2c-pasemi.c
@@ -88,7 +88,7 @@ static void pasemi_smb_clear(struct pasemi_smbus *smbus)
 	reg_write(smbus, REG_SMSTA, status);
 }
 
-static unsigned int pasemi_smb_waitready(struct pasemi_smbus *smbus)
+static int pasemi_smb_waitready(struct pasemi_smbus *smbus)
 {
 	int timeout = 10;
 	unsigned int status;

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