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-rw-r--r--scripts/coccinelle/free/ifnulldev_put.cocci54
1 files changed, 54 insertions, 0 deletions
diff --git a/scripts/coccinelle/free/ifnulldev_put.cocci b/scripts/coccinelle/free/ifnulldev_put.cocci
new file mode 100644
index 000000000000..7ff36e6212ba
--- /dev/null
+++ b/scripts/coccinelle/free/ifnulldev_put.cocci
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/// Since commit b37a46683739 ("netdevice: add the case if dev is NULL"),
+/// NULL check before dev_{put, hold} functions is not needed.
+///
+/// Based on ifnullfree.cocci by Fabian Frederick.
+///
+// Copyright: (C) 2022 Ziyang Xuan.
+// Comments: -
+// Options: --no-includes --include-headers
+
+virtual patch
+virtual org
+virtual report
+virtual context
+
+@r2 depends on patch@
+expression E;
+@@
+- if (E != NULL)
+(
+ __dev_put(E);
+|
+ dev_put(E);
+|
+ dev_put_track(E, ...);
+|
+ __dev_hold(E);
+|
+ dev_hold(E);
+|
+ dev_hold_track(E, ...);
+)
+
+@r depends on context || report || org @
+expression E;
+position p;
+@@
+
+* if (E != NULL)
+* \(__dev_put@p\|dev_put@p\|dev_put_track@p\|__dev_hold@p\|dev_hold@p\|
+* dev_hold_track@p\)(E, ...);
+
+@script:python depends on org@
+p << r.p;
+@@
+
+cocci.print_main("NULL check before dev_{put, hold} functions is not needed", p)
+
+@script:python depends on report@
+p << r.p;
+@@
+
+msg = "WARNING: NULL check before dev_{put, hold} functions is not needed."
+coccilib.report.print_report(p[0], msg)