From: Julia Lawall <Julia.Lawall@lip6.fr>
Date: Mon, 21 Jan 2013 13:02:46 +0000 (+0100)
Subject: drivers/usb/chipidea/core.c: adjust duplicate test
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=5c6e9bf011bca072648017477b0fe36402be1415;p=deliverable%2Flinux.git

drivers/usb/chipidea/core.c: adjust duplicate test

Delete successive tests to the same location.  In this case res has already
been tested for being NULL, and calling devm_request_and_ioremap will not
make it NULL.  On the other hand, devm_request_and_ioremap can return NULL
on failure.

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

// <smpl>
@s exists@
local idexpression y;
expression x,e;
@@

*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
... when != \(y = e\|y += e\|y -= e\|y |= e\|y &= e\|y++\|y--\|&y\)
    when != \(XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\)
*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index aebf695a9344..57cae1f897b2 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -411,7 +411,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
 	}
 
 	base = devm_request_and_ioremap(dev, res);
-	if (!res) {
+	if (!base) {
 		dev_err(dev, "can't request and ioremap resource\n");
 		return -ENOMEM;
 	}