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authorZiyang Xuan <william.xuanziyang@huawei.com>2022-06-16 09:32:53 +0800
committerJulia Lawall <Julia.Lawall@inria.fr>2022-07-16 15:33:55 +0200
commitbbd5c96850d9de535a83a3a3842dec2169cb31d1 (patch)
tree4f964216263f2e06bae4a6fa60906f9b17de0eaf /scripts/coccinelle
parent8e54fe1b0f03a89925925ed98acd2219e0c956d4 (diff)
scripts/coccinelle/free: add NULL test before dev_{put, hold} functions
Since commit b37a46683739 ("netdevice: add the case if dev is NULL"), NULL check before dev_{put, hold} functions is not needed. Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Diffstat (limited to 'scripts/coccinelle')
-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)