linux-kernel - Re: [PATCH 02/35] media: stb0899: Remove unreacheable code

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Date: Tue, 16 Apr 2024 10:32:14 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Martin Tuma <martin.tuma@...iteqautomotive.com>,
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Subject: Re: [PATCH 02/35] media: stb0899: Remove unreacheable code

On Mon, Apr 15, 2024 at 07:34:19PM +0000, Ricardo Ribalda wrote:
> chip_id is an unsigned number, it can never be < 0
> 
> Fixes cocci check:
> drivers/media/dvb-frontends/stb0899_drv.c:1280:8-15: WARNING: Unsigned expression compared with zero: chip_id > 0
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/dvb-frontends/stb0899_drv.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/media/dvb-frontends/stb0899_drv.c b/drivers/media/dvb-frontends/stb0899_drv.c
> index 2f4d8fb400cd..222b5476ebfd 100644
> --- a/drivers/media/dvb-frontends/stb0899_drv.c
> +++ b/drivers/media/dvb-frontends/stb0899_drv.c
> @@ -1277,11 +1277,6 @@ static int stb0899_get_dev_id(struct stb0899_state *state)
>  	dprintk(state->verbose, FE_ERROR, 1, "Demodulator Core ID=[%s], Version=[%d]", (char *) &demod_str, demod_ver);
>  	CONVERT32(STB0899_READ_S2REG(STB0899_S2FEC, FEC_CORE_ID_REG), (char *)&fec_str);
>  	fec_ver = STB0899_READ_S2REG(STB0899_S2FEC, FEC_VER_ID_REG);
> -	if (! (chip_id > 0)) {

This is not dead code.  It's possible for chip_id to be equal to 0.

regards,
dan carpenter

> -		dprintk(state->verbose, FE_ERROR, 1, "couldn't find a STB 0899");
> -
> -		return -ENODEV;
> -	}
>  	dprintk(state->verbose, FE_ERROR, 1, "FEC Core ID=[%s], Version=[%d]", (char*) &fec_str, fec_ver);