On 2/13/21 7:03 AM, Hans de Goede wrote:
[ ... ]
>
> I think something like this should work:
>
> static int devm_delayed_work_autocancel(struct device *dev, struct
> delayed_work *w,
> void (*worker)(struct work_struct
> *work)) {
> INIT_DELAYED_WORK(w, worker);
> return devm_add_action(dev, (void (*action)(void
> *))cancel_delayed_work_sync, w);
> }
>
> I'm not sure about the cast, that may need something like this instead:
>
> typedef void (*devm_action_func)(void *);
>
> static int devm_delayed_work_autocancel(struct device *dev, struct
> delayed_work *w,
> void (*worker)(struct work_struct
> *work)) {
> INIT_DELAYED_WORK(w, worker);
> return devm_add_action(dev, (devm_action_func)cancel_delayed_work_sync,
> w);
Unfortunately, you can not type cast function pointers in C. It is against the
C ABI.
I am sure it is done in a few places in the kernel anyway, but those are wrong.
This is the reason why many calls to devm_add_action() point to functions such
as
static void visconti_clk_disable_unprepare(void *data)
{
clk_disable_unprepare(data);
}
which could otherwise be handled using typecasts.
Guenter
