linux-kernel - [PATCH] coccinelle: api: check for propagation of error from platform_get

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Message-Id: <1451157891-24881-1-git-send-email-Julia.Lawall@lip6.fr>
Date:	Sat, 26 Dec 2015 20:24:51 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.com>, cocci@...teme.lip6.fr,
	linux-kernel@...r.kernel.org,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	kernel-janitors@...r.kernel.org
Subject: [PATCH] coccinelle: api: check for propagation of error from platform_get_irq

The error return value of platform_get_irq seems to often get dropped.

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 scripts/coccinelle/api/platform_get_irq_return.cocci |   53 ++++++++++
 1 file changed, 53 insertions(+)

diff --git a/scripts/coccinelle/api/platform_get_irq_return.cocci b/scripts/coccinelle/api/platform_get_irq_return.cocci
new file mode 100644
index 0000000..96fc560
--- /dev/null
+++ b/scripts/coccinelle/api/platform_get_irq_return.cocci
@@ -0,0 +1,53 @@
+/// Propagate the return value of platform_get_irq.
+//# Sometimes the return value of platform_get_irq is tested using <= 0, but 0
+//# might not be an appropriate return value in an error case.
+///
+// Confidence: Moderate
+// Copyright: (C) 2015 Julia Lawall, Inria. GPLv2.
+// URL: http://coccinelle.lip6.fr/
+// Options: --no-includes --include-headers
+
+virtual context
+virtual org
+virtual report
+
+// ----------------------------------------------------------------------------
+
+@r depends on context || org || report@
+constant C;
+expression e, ret;
+position j0, j1, j2;
+@@
+
+* e@j0 = platform_get_irq(...);
+if (...) {
+  ...
+  ret@j1 = -C;
+  ...
+  return ret@j2;
+}
+
+// ----------------------------------------------------------------------------
+
+@...ipt:python r_org depends on org@
+j0 << r.j0;
+j1 << r.j1;
+j2 << r.j2;
+@@
+
+msg = "Propagate return value of platform_get_irq."
+coccilib.org.print_todo(j0[0], msg)
+coccilib.org.print_link(j1[0], "")
+coccilib.org.print_link(j2[0], "")
+
+// ----------------------------------------------------------------------------
+
+@...ipt:python r_report depends on report@
+j0 << r.j0;
+j1 << r.j1;
+j2 << r.j2;
+@@
+
+msg = "Propagate return value of platform_get_irq around lines %s,%s." % (j1[0].line,j2[0].line)
+coccilib.report.print_report(j0[0], msg)
+

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