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To:     kernel-janitors@vger.kernel.org,
        Gilles Muller <Gilles.Muller@lip6.fr>,
        Julia Lawall <Julia.Lawall@lip6.fr>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Michal Marek <michal.lkml@markovi.net>,
        Nicolas Palix <nicolas.palix@imag.fr>
From:   Markus Elfring <Markus.Elfring@web.de>
Subject: [PATCH] Coccinelle: Add a SmPL script for the reconsideration of
 redundant dev_err() calls
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Cc:     Coccinelle <cocci@systeme.lip6.fr>,
        LKML <linux-kernel@vger.kernel.org>,
        Ding Xiang <dingxiang@cmss.chinamobile.com>
Message-ID: <05d85182-7ec3-8fc1-4bcd-fd2528de3a40@web.de>
Date:   Thu, 20 Jun 2019 19:30:56 +0200
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From: Markus Elfring <elfring@users.sourceforge.net>
Date: Thu, 20 Jun 2019 19:12:53 +0200

The function =E2=80=9Cdevm_ioremap_resource=E2=80=9D contains appropriate =
error reporting.
Thus it can be questionable to present another error message
at other places.

Provide design options for the adjustment of affected source code
by the means of the semantic patch language (Coccinelle software).

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
=2D--
 .../coccinelle/misc/redundant_dev_err.cocci   | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 scripts/coccinelle/misc/redundant_dev_err.cocci

diff --git a/scripts/coccinelle/misc/redundant_dev_err.cocci b/scripts/coc=
cinelle/misc/redundant_dev_err.cocci
new file mode 100644
index 000000000000..aeb228280276
=2D-- /dev/null
+++ b/scripts/coccinelle/misc/redundant_dev_err.cocci
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/// Reconsider a function call for redundant error reporting.
+//
+// Keywords: dev_err redundant device error messages
+// Confidence: Medium
+
+virtual patch
+virtual context
+virtual org
+virtual report
+
+@display depends on context@
+expression e;
+@@
+ e =3D devm_ioremap_resource(...);
+ if (IS_ERR(e))
+ {
+*   dev_err(...);
+    return (...);
+ }
+
+@deletion depends on patch@
+expression e;
+@@
+ e =3D devm_ioremap_resource(...);
+ if (IS_ERR(e))
+-{
+-   dev_err(...);
+    return (...);
+-}
+
+@or depends on org || report@
+expression e;
+position p;
+@@
+ e =3D devm_ioremap_resource(...);
+ if (IS_ERR(e))
+ {
+    dev_err@p(...);
+    return (...);
+ }
+
+@script:python to_do depends on org@
+p << or.p;
+@@
+coccilib.org.print_todo(p[0],
+                        "WARNING: An error message is probably not needed=
 here because the previously called function contains appropriate error re=
porting.")
+
+@script:python reporting depends on report@
+p << or.p;
+@@
+coccilib.report.print_report(p[0],
+                             "WARNING: An error message is probably not n=
eeded here because the previously called function contains appropriate err=
or reporting.")
=2D-
2.22.0