I see, kfree does nothing with null pointers and direct return.
but again kfree is not a good suggestion.
On 5/25/20 5:50 PM, Markus Elfring wrote:
The duplicate memory release should be deleted from the implementation
of the callback function "rcu_free_wq".
I tried to help with the selection of a better commit message.
I have taken another look also at the implementation of the function “destroy_workqueue”.
* The function call “destroy_workqueue” can be performed there in an if branch
after the statement “wq->rescuer = NULL” was executed.
* This data processing is independent from a possible call of the
function “call_rcu(&wq->rcu, rcu_free_wq)” in another if branch.
Thus it seems that a null pointer is intentionally passed by a data structure
member to this callback function on demand.
The corresponding call of the function “kfree” can tolerate this special case.
Now I find that the proposed change can be inappropriate.
Regards,
Markus
