[PATCH 1/9] workqueue: devres: Add device-managed allocate workqueue

[Danilo Krummrich]

On Mon Feb 23, 2026 at 8:27 AM CET, Krzysztof Kozlowski wrote:
> +__printf(2, 5) struct workqueue_struct *
> +devm_alloc_workqueue(struct device *dev, const char *fmt, unsigned int flags,
> +		     int max_active, ...)
> +{
> +	struct workqueue_struct **ptr, *wq;
> +	va_list args;
> +
> +	ptr = devres_alloc(devm_destroy_workqueue, sizeof(*ptr), GFP_KERNEL);

The function pointer passed to devres_alloc() is commonly named *_release().

> +	if (!ptr)
> +		return NULL;
> +
> +	va_start(args, max_active);
> +	wq = alloc_workqueue(fmt, flags, max_active, args);
> +	va_end(args);
> +	if (wq) {
> +		*ptr = wq;
> +		devres_add(dev, ptr);
> +	} else {
> +		devres_free(ptr);
> +	}
> +
> +	return wq;
> +}
> +EXPORT_SYMBOL_GPL(devm_alloc_workqueue);

<snip>

> +void devm_destroy_workqueue(struct device *dev, void *res)
> +{
> +	destroy_workqueue(*(struct workqueue_struct **)res);
> +}
> +EXPORT_SYMBOL_GPL(devm_destroy_workqueue);

I assume you did not mean to export the release callback (which doesn't seem to
be useful), but a function that calls devres_destroy(), i.e. something analogous
to devm_remove_action().

If you don't actually need it, I would prefer not to add something that calls
devres_destroy() for now.