scripts: Coccinelle script for pci_free_consistent()

Created coccinelle script for reporting missing pci_free_consistent() calls.
Signed-off-by: Petr Strnad <strnape1@fel.cvut.cz>
Signed-off-by: Nicolas Palix <nicolas.palix@imag.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/coccinelle/free/pci_free_consistent.cocci

+/// 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
+
+@search@
+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 ...;
+)
+
+@script: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)
+
+@script: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)