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

[Greg KH]

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
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
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