Re: [PATCH 1/1] HID: usbhid: hid-pidff: Set Replay Length to Infinite when set to 0

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Sep 30, 2022 at 10:51:27PM +0000, Paul Jones wrote:
> Greetings,
>  
> Started using my Accuforce v2 Sim wheel on Linux. I was getting no response from racing simulators through Wine, but native linux test tools worked fine. It seems that many real-world applications will send 0 as the replay length, which was resulting in the behavior I was experiencing (nothing). It makes sense to interpret 0 as an infinite effect and therefore set the replay length of the effect to 0xffff. While the PID document does not explicitly state that 0 should be infinite, it does hint toward null values being interpreted as infinite.
>  
> ---
>  
> diff --git a/drivers/hid/usbhid/hid-pidff.c b/drivers/hid/usbhid/hid-pidff.c
> index 3b4ee21cd811..70653451c860 100644
> --- a/drivers/hid/usbhid/hid-pidff.c
> +++ b/drivers/hid/usbhid/hid-pidff.c
> @@ -301,7 +301,7 @@ static void pidff_set_effect_report(struct pidff_device *pidff,
>  pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0];
> pidff->set_effect_type->value[0] =
>  pidff->create_new_effect_type->value[0];
> - pidff->set_effect[PID_DURATION].value[0] = effect->replay.length;
> + pidff->set_effect[PID_DURATION].value[0] = effect->replay.length == 0 ? 0xffff : effect->replay.length;
> pidff->set_effect[PID_TRIGGER_BUTTON].value[0] = effect->trigger.button;
> pidff->set_effect[PID_TRIGGER_REPEAT_INT].value[0] =
>  effect->trigger.interval;
>  
> -- 
>  
> - Paul
>  

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
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created.  Hopefully you will not take offence and will fix the problem
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