linux-kernel - Re: [PATCH resend] staging:xgifb:remove unused code

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Message-ID: <20160823102325.GB10101@kroah.com>
Date:   Tue, 23 Aug 2016 06:23:25 -0400
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ding Xiang <dingxiang@...wei.com>
Cc:     arnaud.patard@...-net.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH resend] staging:xgifb:remove unused code

On Tue, Aug 23, 2016 at 05:17:30PM +0800, Ding Xiang wrote:
> The variable data is assigned but never used in rest code.
> 
> Signed-off-by: Ding Xiang <dingxiang@...wei.com>
> ---
>  drivers/staging/xgifb/vb_setmode.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/staging/xgifb/vb_setmode.c b/drivers/staging/xgifb/vb_setmode.c
> index 50c8ea4..71bb9ca 100644
> --- a/drivers/staging/xgifb/vb_setmode.c
> +++ b/drivers/staging/xgifb/vb_setmode.c
> @@ -727,7 +727,6 @@ static void XGI_SetCRT1DE(unsigned short ModeIdIndex,
>  		tempax |= 0x40;
>  
>  	xgifb_reg_and_or(pVBInfo->P3d4, 0x07, ~0x42, tempax);
> -	data = xgifb_reg_get(pVBInfo->P3d4, 0x07);

But this did something with the hardware, are you sure this doesn't
break anything?  Lots of hardware works with the sequence of:
	write something
	read something to make sure the write worked.

Did you test this?

thanks,

greg k-h