linux-kernel - Re: [PATCH v2] HID: logitech: fix a used uninitialized GCC warning

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Date:   Fri, 21 Sep 2018 09:46:54 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <jikos@...nel.org>, <benjamin.tissoires@...hat.com>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] HID: logitech: fix a used uninitialized GCC warning

Hi Jiri

Can you pick up the patch?

Thanks
zhong jiang

On 2018/9/13 15:41, zhong jiang wrote:
> Fix the following compile warning:
>
> drivers/hid/hid-logitech-hidpp.c: In function 'hi_res_scroll_enable':
> drivers/hid/hid-logitech-hidpp.c:2714:54: warning: 'multiplier' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   hidpp->vertical_wheel_counter.resolution_multiplier = multiplier;
>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
> v1->v2:
>      According to Benjamin's suggestion, To initialize the value
> and remove the duplicated assignement. 
>
>  drivers/hid/hid-logitech-hidpp.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
> index 5f0c080..f012808 100644
> --- a/drivers/hid/hid-logitech-hidpp.c
> +++ b/drivers/hid/hid-logitech-hidpp.c
> @@ -1231,7 +1231,6 @@ static int hidpp_hrw_get_wheel_capability(struct hidpp_device *hidpp,
>  	*multiplier = response.fap.params[0];
>  	return 0;
>  return_default:
> -	*multiplier = 8;
>  	hid_warn(hidpp->hid_dev,
>  		 "Couldn't get wheel multiplier (error %d), assuming %d.\n",
>  		 ret, *multiplier);
> @@ -2696,7 +2695,7 @@ static int hi_res_scroll_look_up_microns(__u32 product_id)
>  static int hi_res_scroll_enable(struct hidpp_device *hidpp)
>  {
>  	int ret;
> -	u8 multiplier;
> +	u8 multiplier = 8;
>  
>  	if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_X2121) {
>  		ret = hidpp_hrw_set_wheel_mode(hidpp, false, true, false);
> @@ -2704,10 +2703,9 @@ static int hi_res_scroll_enable(struct hidpp_device *hidpp)
>  	} else if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_X2120) {
>  		ret = hidpp_hrs_set_highres_scrolling_mode(hidpp, true,
>  							   &multiplier);
> -	} else /* if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_1P0) */ {
> +	} else /* if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_1P0) */
>  		ret = hidpp10_enable_scrolling_acceleration(hidpp);
> -		multiplier = 8;
> -	}
> +
>  	if (ret)
>  		return ret;
>