linux-kernel - [PATCH] scripts: Coccinelle script for pci_free

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Message-ID: <20130508230308.Horde.hkDwg5wWGGBzmzKnqIjUhg1@wimap.feld.cvut.cz>
Date:	Wed, 08 May 2013 23:03:08 +0200
From:	strnape1@....cvut.cz
To:	kernel-janitors@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, cocci@...teme.lip6.fr,
	mmarek@...e.cz, julia.lawall@...6.fr
Subject: [PATCH] scripts: Coccinelle script for pci_free_consistent()

Created coccinelle script for reporting missing pci_free_consistent() calls.

Signed-off-by: Petr Strnad <strnape1@....cvut.cz>
---
diff --git a/scripts/coccinelle/free/pci_free_consistent.cocci  
b/scripts/coccinelle/free/pci_free_consistent.cocci
new file mode 100644
index 0000000..43600cc
--- /dev/null
+++ b/scripts/coccinelle/free/pci_free_consistent.cocci
@@ -0,0 +1,52 @@
+/// Find missing pci_free_consistent for every pci_alloc_consistent.
+///
+// Confidence: Moderate
+// Copyright: (C) 2013 Petr Strnad.  GPLv2.
+// URL: http://coccinelle.lip6.fr/
+// Keywords: pci_free_consistent, pci_alloc_consistent
+// Options: --no-includes --include-headers
+
+virtual report
+virtual org
+
+@...rch@
+local idexpression id;
+expression x,y,z,e;
+position p1,p2;
+type T;
+@@
+
+id = pci_alloc_consistent@p1(x,y,&z)
+... when != e = id
+if (id == NULL || ...) { ... return ...; }
+... when != pci_free_consistent(x,y,id,z)
+    when != if (id) { ... pci_free_consistent(x,y,id,z) ... }
+    when != if (y) { ... pci_free_consistent(x,y,id,z) ... }
+    when != e = (T)id
+    when exists
+(
+return 0;
+|
+return 1;
+|
+return id;
+|
+return@p2 ...;
+)
+
+@...ipt:python depends on report@
+p1 << search.p1;
+p2 << search.p2;
+@@
+
+msg = "ERROR: missing pci_free_consistent; pci_alloc_consistent on  
line %s and return without freeing on line %s" % (p1[0].line,p2[0].line)
+coccilib.report.print_report(p2[0],msg)
+
+@...ipt:python depends on org@
+p1 << search.p1;
+p2 << search.p2;
+@@
+
+msg = "ERROR: missing pci_free_consistent; pci_alloc_consistent on  
line %s and return without freeing on line %s" % (p1[0].line,p2[0].line)
+cocci.print_main(msg,p1)
+cocci.print_secs("",p2)

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