linux-kernel - [PATCH 1/2] coccinelle: Add patch for replacing open-coded PTR

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Date:	Mon, 19 Dec 2011 14:24:22 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Julia Lawall <julia@...u.dk>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <npalix.work@...il.com>
CC:	<cocci@...u.dk>, <linux-kernel@...r.kernel.org>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH 1/2] coccinelle: Add patch for replacing open-coded PTR_RET

The PTR_RET function returns the error value of its parameter if it is an
ERR_PTR, otherwise it returns 0. This patch adds a semantic patch which finds
open-coded instances of this check and replaces them.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
---
 scripts/coccinelle/api/ptr_ret.cocci |   55 ++++++++++++++++++++++++++++++++++
 1 files changed, 55 insertions(+), 0 deletions(-)
 create mode 100644 scripts/coccinelle/api/ptr_ret.cocci

diff --git a/scripts/coccinelle/api/ptr_ret.cocci b/scripts/coccinelle/api/ptr_ret.cocci
new file mode 100644
index 0000000..dfd9b1f
--- /dev/null
+++ b/scripts/coccinelle/api/ptr_ret.cocci
@@ -0,0 +1,55 @@
+///
+/// Use PTR_RET function instead of open coding it
+///
+// Confidence: High
+// Options:
+//
+// Keywords: IS_ERR, PTR_ERR, PTR_RET
+// Version min: 2.6.39
+//
+
+virtual context
+virtual patch
+virtual org
+virtual report
+
+@...ends on context@
+expression x;
+@@
+*if (IS_ERR(x))
+*	return PTR_ERR(x);
+*return 0;
+
+@...ends on patch@
+expression x;
+@@
+-if (IS_ERR(x))
+-	return PTR_ERR(x);
+-return 0;
++return PTR_RET(x);
+
+@r depends on org || report@
+expression x;
+position p;
+@@
+
+ if (IS_ERR@p(x))
+	return PTR_ERR(x);
+ return 0;
+
+@...ipt:python depends on org@
+p << r.p;
+x << r.x;
+@@
+
+msg="WARNING PTR_RET can be used with %s" % (x)
+msg_safe=msg.replace("[","@(").replace("]",")")
+coccilib.org.print_todo(p[0], msg_safe)
+
+@...ipt:python depends on report@
+p << r.p;
+x << r.x;
+@@
+
+msg="WARNING: PTR_RET can be used with %s" % (x)
+coccilib.report.print_report(p[0], msg)
-- 
1.7.7.3


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