[PATCH v4 3/3] coccinelle: Add script to check for platform_get_irq() excessive prints

From: Stephen Boyd <swboyd@chromium.org>
To: Julia Lawall <Julia.Lawall@lip6.fr>,
	Gilles Muller <Gilles.Muller@lip6.fr>,
	Nicolas Palix <nicolas.palix@imag.fr>,
	Michal Marek <michal.lkml@markovi.net>
Cc: linux-kernel@vger.kernel.org, cocci@systeme.lip6.fr,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Rob Herring <robh@kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Javier Martinez Canillas <javierm@redhat.com>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Mark Brown <broonie@kernel.org>,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: [PATCH v4 3/3] coccinelle: Add script to check for platform_get_irq() excessive prints
Date: Tue, 23 Jul 2019 11:16:24 -0700	[thread overview]
Message-ID: <20190723181624.203864-4-swboyd@chromium.org> (raw)
In-Reply-To: <20190723181624.203864-1-swboyd@chromium.org>

Add a coccinelle script to check for the usage of dev_err() after a call
to platform_get_irq{,_byname}() as it's redundant now that the function
already prints an error when it fails.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 scripts/coccinelle/api/platform_get_irq.cocci | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 scripts/coccinelle/api/platform_get_irq.cocci

diff --git a/scripts/coccinelle/api/platform_get_irq.cocci b/scripts/coccinelle/api/platform_get_irq.cocci
new file mode 100644
index 000000000000..6ec6e70bbbba
--- /dev/null
+++ b/scripts/coccinelle/api/platform_get_irq.cocci
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/// Remove dev_err() messages after platform_get_irq*() failures
+//
+// Confidence: Medium
+// Options: --include-headers
+
+virtual patch
+virtual context
+virtual org
+virtual report
+
+@depends on context@
+expression ret;
+struct platform_device *E;
+@@
+
+ret =
+(
+platform_get_irq(E, ...)
+|
+platform_get_irq_byname(E, ...)
+);
+
+if ( \( ret < 0 \| ret <= 0 \) )
+{
+(
+if (ret != -EPROBE_DEFER)
+{ ...
+*dev_err(...);
+... }
+|
+...
+*dev_err(...);
+)
+...
+}
+
+@depends on patch@
+expression ret;
+struct platform_device *E;
+@@
+
+ret =
+(
+platform_get_irq(E, ...)
+|
+platform_get_irq_byname(E, ...)
+);
+
+if ( \( ret < 0 \| ret <= 0 \) )
+{
+(
+-if (ret != -EPROBE_DEFER)
+-{ ...
+-dev_err(...);
+-... }
+|
+...
+-dev_err(...);
+)
+...
+}
+
+@r depends on org || report@
+position p1;
+expression ret;
+struct platform_device *E;
+@@
+
+ret =
+(
+platform_get_irq(E, ...)
+|
+platform_get_irq_byname(E, ...)
+);
+
+if ( \( ret < 0 \| ret <= 0 \) )
+{
+(
+if (ret != -EPROBE_DEFER)
+{ ...
+dev_err@p1(...);
+... }
+|
+...
+dev_err@p1(...);
+)
+...
+}
+
+@script:python depends on org@
+p1 << r.p1;
+@@
+
+cocci.print_main(p1)
+
+@script:python depends on report@
+p1 << r.p1;
+@@
+
+msg = "line %s is redundant because platform_get_irq() already prints an error" % (p1[0].line)
+coccilib.report.print_report(p1[0],msg)
-- 
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