linux-kernel - Re: [PATCH -next] staging: vc04_services: remove set but unused variable 'local_entity

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Date:   Tue, 11 Feb 2020 17:24:33 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     nsaenzjulienne@...e.de, gregkh@...uxfoundation.org,
        wahrenst@....net, jamal.k.shareef@...il.com,
        marcgonzalez@...gle.com, nishkadg.linux@...il.com,
        nachukannan@...il.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH -next] staging: vc04_services: remove set but unused
 variable 'local_entity_uc'

On Tue, Feb 11, 2020 at 09:43:56PM +0800, YueHaibing wrote:
> drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function vchiq_use_internal:
> drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:2346:16:
>  warning: variable local_entity_uc set but not used [-Wunused-but-set-variable]
> 
> commit bd8aa2850f00 ("staging: vc04_services: Get of even more suspend/resume states")
> left behind this unused variable.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> index c456ced..d30d24d 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> @@ -2343,7 +2343,7 @@ vchiq_use_internal(struct vchiq_state *state, struct vchiq_service *service,
>  	enum vchiq_status ret = VCHIQ_SUCCESS;
>  	char entity[16];
>  	int *entity_uc;
> -	int local_uc, local_entity_uc;
> +	int local_uc;
>  
>  	if (!arm_state)
>  		goto out;
> @@ -2367,7 +2367,6 @@ vchiq_use_internal(struct vchiq_state *state, struct vchiq_service *service,
>  
>  	write_lock_bh(&arm_state->susp_res_lock);
>  	local_uc = ++arm_state->videocore_use_count;
> -	local_entity_uc = ++(*entity_uc);
                          ^^
This ++ is required.

regards,
dan carpenter