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From: Nathan Chancellor <nathan@kernel.org>
To: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: linuxarm@huawei.com, mauro.chehab@huawei.com,
	Bixuan Cui <cuibixuan@huawei.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
	llvm@lists.linux.dev
Subject: Re: [PATCH 20/20] media: mxl5005s: drop some dead code
Date: Fri, 26 Nov 2021 13:30:17 -0700	[thread overview]
Message-ID: <YaFD2RmjE1QlBKr9@archlinux-ax161> (raw)
In-Reply-To: <b1b447e2f3e1ec0c3e9716f4f74d056461f69ab3.1637781097.git.mchehab+huawei@kernel.org>

On Wed, Nov 24, 2021 at 08:13:23PM +0100, Mauro Carvalho Chehab wrote:
> As reported by clang (with W=1), the ctrlVal var is never used.
> 
> Yet, there are even some loops to estimate it. As this is dead
> code, remove it. If ever needed, someone could revert this
> patch.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

> ---
> 
> To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
> See [PATCH 00/20] at: https://lore.kernel.org/all/cover.1637781097.git.mchehab+huawei@kernel.org/
> 
>  drivers/media/tuners/mxl5005s.c | 14 +-------------
>  1 file changed, 1 insertion(+), 13 deletions(-)
> 
> diff --git a/drivers/media/tuners/mxl5005s.c b/drivers/media/tuners/mxl5005s.c
> index f6e82a8e7d37..ab4c43df9d18 100644
> --- a/drivers/media/tuners/mxl5005s.c
> +++ b/drivers/media/tuners/mxl5005s.c
> @@ -3414,9 +3414,8 @@ static u16 MXL_ControlWrite_Group(struct dvb_frontend *fe, u16 controlNum,
>  	u32 value, u16 controlGroup)
>  {
>  	struct mxl5005s_state *state = fe->tuner_priv;
> -	u16 i, j, k;
> +	u16 i, j;
>  	u32 highLimit;
> -	u32 ctrlVal;
>  
>  	if (controlGroup == 1) /* Initial Control */ {
>  
> @@ -3432,9 +3431,6 @@ static u16 MXL_ControlWrite_Group(struct dvb_frontend *fe, u16 controlNum,
>  							(u8)(state->Init_Ctrl[i].bit[j]),
>  							(u8)((value>>j) & 0x01));
>  					}
> -					ctrlVal = 0;
> -					for (k = 0; k < state->Init_Ctrl[i].size; k++)
> -						ctrlVal += state->Init_Ctrl[i].val[k] * (1 << k);
>  				} else
>  					return -1;
>  			}
> @@ -3454,9 +3450,6 @@ static u16 MXL_ControlWrite_Group(struct dvb_frontend *fe, u16 controlNum,
>  							(u8)(state->CH_Ctrl[i].bit[j]),
>  							(u8)((value>>j) & 0x01));
>  					}
> -					ctrlVal = 0;
> -					for (k = 0; k < state->CH_Ctrl[i].size; k++)
> -						ctrlVal += state->CH_Ctrl[i].val[k] * (1 << k);
>  				} else
>  					return -1;
>  			}
> @@ -3477,11 +3470,6 @@ static u16 MXL_ControlWrite_Group(struct dvb_frontend *fe, u16 controlNum,
>  							(u8)(state->MXL_Ctrl[i].bit[j]),
>  							(u8)((value>>j) & 0x01));
>  					}
> -					ctrlVal = 0;
> -					for (k = 0; k < state->MXL_Ctrl[i].size; k++)
> -						ctrlVal += state->
> -							MXL_Ctrl[i].val[k] *
> -							(1 << k);
>  				} else
>  					return -1;
>  			}
> -- 
> 2.33.1
> 
> 

  reply	other threads:[~2021-11-26 20:32 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-24 19:13 [PATCH 00/20] Solve the remaining issues with clang and W=1 on media Mauro Carvalho Chehab
2021-11-24 19:13 ` [PATCH 01/20] media: adv7842: get rid of two unused functions Mauro Carvalho Chehab
2021-11-26 18:54   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 02/20] media: saa7134-go7007: get rid of to_state() function Mauro Carvalho Chehab
2021-11-26 18:55   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 03/20] media: davinci: get rid of an unused function Mauro Carvalho Chehab
2021-11-26 18:56   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 04/20] media: drxd: drop offset var from DownloadMicrocode() Mauro Carvalho Chehab
2021-11-26 18:57   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 05/20] media: drxk: drop operation_mode from set_dvbt() Mauro Carvalho Chehab
2021-11-26 19:02   ` Nathan Chancellor
2021-11-29  8:33     ` [PATCH v2 " Mauro Carvalho Chehab
2021-11-24 19:13 ` [PATCH 06/20] media: m88ds3103: drop reg11 calculus from m88ds3103b_select_mclk() Mauro Carvalho Chehab
2021-11-26 19:40   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 07/20] media: si21xx: report eventual errors at set_frontend Mauro Carvalho Chehab
2021-11-26 19:45   ` Nathan Chancellor
2021-11-29  8:40     ` Mauro Carvalho Chehab
2021-11-24 19:13 ` [PATCH 08/20] media: solo6x10: add _maybe_unused to currently unused functions Mauro Carvalho Chehab
2021-11-25 21:18   ` Ismael Luceno
2021-11-26 19:58   ` Nathan Chancellor
2021-11-29  8:44     ` Mauro Carvalho Chehab
2021-11-24 19:13 ` [PATCH 09/20] media: si470x: fix printk warnings with clang Mauro Carvalho Chehab
2021-11-26 20:13   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 10/20] media: radio-si476x: drop a container_of() abstraction macro Mauro Carvalho Chehab
2021-11-26 20:14   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 11/20] media: lmedm04: don't ignore errors when setting a filter Mauro Carvalho Chehab
2021-11-26 20:16   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 12/20] media: au0828-i2c: drop a duplicated function Mauro Carvalho Chehab
2021-11-26 20:22   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 13/20] media: adv7604 add _maybe_unused to currently unused functions Mauro Carvalho Chehab
2021-11-24 19:13 ` [PATCH 14/20] media: adv7511: drop " Mauro Carvalho Chehab
2021-11-26 20:27   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 15/20] media: imx290: mark read reg function as __maybe_unused Mauro Carvalho Chehab
2021-11-24 19:13 ` [PATCH 16/20] media: davinci: vpbe_osd: " Mauro Carvalho Chehab
2021-11-24 19:13 ` [PATCH 17/20] media: qcom: camss: " Mauro Carvalho Chehab
2021-11-25 10:58   ` Robert Foss
2021-11-24 19:13 ` [PATCH 18/20] media: mtk-mdp: address a clang warning Mauro Carvalho Chehab
2021-11-24 19:21   ` Arnd Bergmann
2021-11-24 19:13 ` [PATCH 19/20] media: cobalt: drop an unused variable Mauro Carvalho Chehab
2021-11-26 20:29   ` Nathan Chancellor
2021-11-24 19:13 ` [PATCH 20/20] media: mxl5005s: drop some dead code Mauro Carvalho Chehab
2021-11-26 20:30   ` Nathan Chancellor [this message]
2021-11-24 19:23 ` [PATCH 00/20] Solve the remaining issues with clang and W=1 on media Arnd Bergmann

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