[PATCH] usb_kbd: fix overpolling of keyboard

[Sascha Hauer]

Hi Aleksey,

On Wed, Mar 02, 2016 at 01:50:36PM +0300, Aleksey Kuleshov wrote:
> - use async callings to call poll function
> - remove unused
> - remove unnecessary locking

The changes look ok, but could you split them up by logical changes?
This patch does too much at once.

This patch does not solve the problem with the double return key
detected, right?

Sascha

> ---
>  drivers/input/usb_kbd.c | 41 ++++++++++++++++++++---------------------
>  1 file changed, 20 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/input/usb_kbd.c b/drivers/input/usb_kbd.c
> index 74bc11f..03796f3 100644
> --- a/drivers/input/usb_kbd.c
> +++ b/drivers/input/usb_kbd.c
> @@ -46,13 +46,10 @@
>  struct usb_kbd_pdata;
>  
>  struct usb_kbd_pdata {
> -	uint64_t	last_report;
>  	uint8_t		*new;
>  	uint8_t		old[USB_KBD_BOOT_REPORT_SIZE];
> -	uint8_t		flags;
> -	struct poller_struct	poller;
> +	struct poller_async	poller;
>  	struct usb_device	*usbdev;
> -	int		lock;
>  	unsigned long	intpipe;
>  	int		intpktsize;
>  	int		intinterval;
> @@ -94,23 +91,17 @@ static const unsigned char usb_kbd_keycode[256] = {
>  	150,158,159,128,136,177,178,176,142,152,173,140
>  };
>  
> -static void usb_kbd_poll(struct poller_struct *poller)
> +static void usb_kbd_poll(void *arg)
>  {
> -	struct usb_kbd_pdata *data = container_of(poller,
> -						  struct usb_kbd_pdata, poller);
> +	struct usb_kbd_pdata *data = arg;
>  	struct usb_device *usbdev = data->usbdev;
>  	int ret, i;
>  
> -	if (data->lock)
> -		return;
> -
> -	data->lock = 1;
> -
>  	ret = data->do_poll(data);
>  	if (ret == -EAGAIN)
>  		goto exit;
>  	if (ret < 0) {
> -		/* exit and lock forever */
> +		/* exit and die forever */
>  		dev_err(&usbdev->dev,
>  			"usb_submit_int_msg() failed. Keyboard disconnect?\n");
>  		return;
> @@ -125,7 +116,6 @@ static void usb_kbd_poll(struct poller_struct *poller)
>  		input_report_key_event(&data->input, usb_kbd_keycode[i + 224], (data->new[0] >> i) & 1);
>  
>  	for (i = 2; i < 8; i++) {
> -
>  		if (data->old[i] > 3 && memscan(data->new + 2, data->old[i], 6) == data->new + 8) {
>  			if (usb_kbd_keycode[data->old[i]])
>  				input_report_key_event(&data->input, usb_kbd_keycode[data->old[i]], 0);
> @@ -145,10 +135,10 @@ static void usb_kbd_poll(struct poller_struct *poller)
>  		}
>  	}
>  
> -	memcpy(data->old, data->new, 8);
> +	memcpy(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
>  
>  exit:
> -	data->lock = 0;
> +	poller_call_async(&data->poller, data->intinterval * MSECOND, usb_kbd_poll, data);
>  }
>  
>  static int usb_kbd_probe(struct usb_device *usbdev,
> @@ -173,7 +163,6 @@ static int usb_kbd_probe(struct usb_device *usbdev,
>  	data->new = dma_alloc(USB_KBD_BOOT_REPORT_SIZE);
>  
>  	data->usbdev = usbdev;
> -	data->last_report = get_time_ns();
>  
>  	data->ep = &iface->ep_desc[0];
>  	data->intpipe = usb_rcvintpipe(usbdev, data->ep->bEndpointAddress);
> @@ -199,18 +188,28 @@ static int usb_kbd_probe(struct usb_device *usbdev,
>  	} else
>  		dev_dbg(&usbdev->dev, "poll keyboard via int ep\n");
>  
> -	input_device_register(&data->input);
> +	ret = input_device_register(&data->input);
> +	if (ret) {
> +		dev_err(&usbdev->dev, "can't register input\n");
> +		return ret;
> +	}
> +
> +	ret = poller_async_register(&data->poller);
> +	if (ret) {
> +		dev_err(&usbdev->dev, "can't setup poller\n");
> +		return ret;
> +	}
>  
> -	data->poller.func = usb_kbd_poll;
> +	poller_call_async(&data->poller, data->intinterval * MSECOND, usb_kbd_poll, data);
>  
> -	return poller_register(&data->poller);
> +	return 0;
>  }
>  
>  static void usb_kbd_disconnect(struct usb_device *usbdev)
>  {
>  	struct usb_kbd_pdata *data = usbdev->drv_data;
>  
> -	poller_unregister(&data->poller);
> +	poller_async_unregister(&data->poller);
>  	input_device_unregister(&data->input);
>  	dma_free(data->new);
>  	free(data);
> -- 
> 2.6.2
> 
> 
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