[PATCH v3] Coccinelle: Script to replace NULL test with IS_ERR test for devm_ioremap_resource

[Amitoj Kaur Chawla]

This script detects cases which have incorrect error handling for
devm_ioremap_resource function, employing a NULL test instead of an
IS_ERR() test.

Acked-by: Julia Lawall <julia.lawall@xxxxxxx>
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@xxxxxxxxx>
---
Changes in v2:
        -Changed script to correct error handling instead of just
         detecting cases of incorrect error handling
Changes in v3:
        -Reverted to original script in v1 to ensure no error in
         modifying inconsistent paths.

 .../null/devm_ioremap_resource_test.cocci          | 38 ++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 scripts/coccinelle/null/devm_ioremap_resource_test.cocci

diff --git a/scripts/coccinelle/null/devm_ioremap_resource_test.cocci b/scripts/coccinelle/null/devm_ioremap_resource_test.cocci
new file mode 100644
index 0000000..734dbd3
--- /dev/null
+++ b/scripts/coccinelle/null/devm_ioremap_resource_test.cocci
@@ -0,0 +1,38 @@
+/// Correct error handling for devm_ioremap_resource
+///
+// Confidence: High
+// Copyright: (C) 2016 Amitoj Kaur Chawla
+// Keywords: devm,devm_ioremap_resource
+
+virtual context
+virtual org
+virtual report
+
+// ----------------------------------------------------------------------------
+
+@err depends on context || org || report@
+statement S;
+expression e;
+position j0;
+@@
+
+  e = devm_ioremap_resource(...);
+* if (!e@j0) S
+// ----------------------------------------------------------------------------
+
+@script:python err_org depends on org@
+j0 << err.j0;
+@@
+
+msg = "Incorrect error handling."
+coccilib.org.print_todo(j0[0], msg)
+
+// ----------------------------------------------------------------------------
+
+@script:python err_report depends on report@
+j0 << err.j0;
+@@
+
+msg = "Incorrect error handling."
+coccilib.report.print_report(j0[0], msg)
+
-- 
1.9.1