linux-kernel - [PATCH] scripts/coccinelle: Find threaded IRQs requests which are missing IRQF

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Date:	Sun,  1 Jul 2012 13:17:07 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Julia Lawall <julia@...u.dk>, Michal Marek <mmarek@...e.cz>
Cc:	Thomas Gleixner <tglx@...utronix.de>, cocci@...u.dk,
	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH] scripts/coccinelle: Find threaded IRQs requests which are missing IRQF_ONESHOT

Since commit 1c6c69525b ("genirq: Reject bogus threaded irq requests") threaded
IRQs without a primary handler need to be requested with IRQF_ONESHOT, otherwise
the request will fail. This semantic patch will help to statically identify
(and fix) such cases.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
---
 scripts/coccinelle/misc/irqf_oneshot.cocci |   65 ++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 scripts/coccinelle/misc/irqf_oneshot.cocci

diff --git a/scripts/coccinelle/misc/irqf_oneshot.cocci b/scripts/coccinelle/misc/irqf_oneshot.cocci
new file mode 100644
index 0000000..6cfde94
--- /dev/null
+++ b/scripts/coccinelle/misc/irqf_oneshot.cocci
@@ -0,0 +1,65 @@
+/// Make sure threaded IRQs without a primary handler are always request with
+/// IRQF_ONESHOT
+///
+//
+// Confidence: Good
+// Comments:
+// Options: --no-includes
+
+virtual patch
+virtual context
+virtual org
+virtual report
+
+@r1@
+expression irq;
+expression thread_fn;
+expression flags;
+position p;
+@@
+request_threaded_irq@p(irq, NULL, thread_fn,
+(
+flags | IRQF_ONESHOT
+|
+IRQF_ONESHOT
+)
+, ...)
+
+@...ends on patch@
+expression irq;
+expression thread_fn;
+expression flags;
+position p != r1.p;
+@@
+request_threaded_irq@p(irq, NULL, thread_fn,
+(
+-0
++IRQF_ONESHOT
+|
+-flags
++flags | IRQF_ONESHOT
+)
+, ...)
+
+@...ends on context@
+position p != r1.p;
+@@
+*request_threaded_irq@p(...)
+
+@...ch depends on report || org@
+expression irq;
+position p != r1.p;
+@@
+request_threaded_irq@p(irq, NULL, ...)
+
+@...ipt:python depends on org@
+p << match.p;
+@@
+msg = "ERROR: Threaded IRQ with no primary handler requested without IRQF_ONESHOT"
+coccilib.org.print_todo(p[0],msg)
+
+@...ipt:python depends on report@
+p << match.p;
+@@
+msg = "ERROR: Threaded IRQ with no primary handler requested without IRQF_ONESHOT"
+coccilib.report.print_report(p[0],msg)
-- 
1.7.10

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