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From:   huangzaiyang <huangzaiyang@oppo.com>
To:     <tj@kernel.org>, <jiangshanlai@gmail.com>
CC:     <linux-kernel@vger.kernel.org>,
        huangzaiyang <huangzaiyang@oppo.com>,
        ZaiYang Huang <hzy0719@163.com>
Subject: [PATCH] workqueue: Make a warning when a pending delay work being re-init
Date:   Wed, 15 Nov 2023 19:34:27 +0800
Message-ID: <20231115113427.1420-1-huangzaiyang@oppo.com>
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There is a timer_list race condition if a delay work is queued twice,
this usually won't happen unless someone reinitializes the task before perf=
orming the enqueue operation,like=C3=AF=C2=BC?
https://github.com/torvalds/linux/blob/master/drivers/devfreq/devfreq.c#L48=
7
A warning message will help developers identify this irregular usage.

Signed-off-by: ZaiYang Huang <hzy0719@163.com>
---
 include/linux/workqueue.h | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 24b1e5070f4d..54102ed794e5 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -266,6 +266,22 @@ static inline void destroy_delayed_work_on_stack(struc=
t delayed_work *work) { }
 static inline unsigned int work_static(struct work_struct *work) { return =
0; }
 #endif

+/**
+ * work_pending - Find out whether a work item is currently pending
+ * @work: The work item in question
+ */
+#define work_pending(work) \
+       test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
+
+/**
+ * delayed_work_pending - Find out whether a delayable work item is curren=
tly
+ * pending
+ * @w: The work item in question
+ */
+#define delayed_work_pending(w) \
+       work_pending(&(w)->work)
+
+
 /*
  * initialize all of a work item in one go
  *
@@ -310,6 +326,7 @@ static inline unsigned int work_static(struct work_stru=
ct *work) { return 0; }

 #define __INIT_DELAYED_WORK(_work, _func, _tflags)                     \
        do {                                                            \
+               WARN_ON(delayed_work_pending(_work));                   \
                INIT_WORK(&(_work)->work, (_func));                     \
                __init_timer(&(_work)->timer,                           \
                             delayed_work_timer_fn,                     \
@@ -318,6 +335,7 @@ static inline unsigned int work_static(struct work_stru=
ct *work) { return 0; }

 #define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags)             \
        do {                                                            \
+               WARN_ON(delayed_work_pending(_work));                   \
                INIT_WORK_ONSTACK(&(_work)->work, (_func));             \
                __init_timer_on_stack(&(_work)->timer,                  \
                                      delayed_work_timer_fn,            \
@@ -342,21 +360,6 @@ static inline unsigned int work_static(struct work_str=
uct *work) { return 0; }
 #define INIT_RCU_WORK_ONSTACK(_work, _func)                            \
        INIT_WORK_ONSTACK(&(_work)->work, (_func))

-/**
- * work_pending - Find out whether a work item is currently pending
- * @work: The work item in question
- */
-#define work_pending(work) \
-       test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
-
-/**
- * delayed_work_pending - Find out whether a delayable work item is curren=
tly
- * pending
- * @w: The work item in question
- */
-#define delayed_work_pending(w) \
-       work_pending(&(w)->work)
-
 /*
  * Workqueue flags and constants.  For details, please refer to
  * Documentation/core-api/workqueue.rst.
--
2.17.1

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