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SubjectRe: [PATCH v5] workqueue: Remove unnecessary kfree() call in rcu_free_wq()
On Wed, May 27, 2020 at 03:57:15PM +0800, wrote:
> From: Zhang Qiang <>
> The data structure member "wq->rescuer" was reset to a null pointer
> in one if branch. It was passed to a call of the function "kfree"
> in the callback function "rcu_free_wq" (which was eventually executed).
> The function "kfree" does not perform more meaningful data processing
> for a passed null pointer (besides immediately returning from such a call).
> Thus delete this function call which became unnecessary with the referenced
> software update.
> Fixes: def98c84b6cd ("workqueue: Fix spurious sanity check failures in destroy_workqueue()")
> Suggested-by: Markus Elfring <>
> Signed-off-by: Zhang Qiang <>

Applied to wq/for-5.8.



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