linux-kernel - Re: [PATCH] drm/omap: dsi: fix unreachable code in dsi_vc_send

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Message-ID: <20210126211543.jb6lmcg6jedzruc3@earth.universe>
Date:   Tue, 26 Jan 2021 22:15:43 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     menglong8.dong@...il.com
Cc:     tomba@...nel.org, airlied@...ux.ie, daniel@...ll.ch,
        laurent.pinchart@...asonboard.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Menglong Dong <dong.menglong@....com.cn>
Subject: Re: [PATCH] drm/omap: dsi: fix unreachable code in
 dsi_vc_send_short()

Hi,

On Tue, Jan 26, 2021 at 05:55:11AM -0800, menglong8.dong@...il.com wrote:
> From: Menglong Dong <dong.menglong@....com.cn>
> 
> The 'r' in dsi_vc_send_short() is of type 'unsigned int', so the
> 'r < 0' can't be true.
> 
> Fix this by introducing a 'err' insteaded.
> 
> Fixes: 1ed6253856cb
> ("drm/omap: dsi: switch dsi_vc_send_long/short to mipi_dsi_msg")

Documentation/process/submitting-patches.rst:

If your patch fixes a bug in a specific commit, e.g. you found an
issue using ``git bisect``, please use the 'Fixes:' tag with the
first 12 characters of the SHA-1 ID, and the one line summary. Do
not split the tag across multiple lines, tags are exempt from the
"wrap at 75 columns" rule in order to simplify parsing scripts.

Otherwise:

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

> Signed-off-by: Menglong Dong <dong.menglong@....com.cn>
> ---
>  drivers/gpu/drm/omapdrm/dss/dsi.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index 8e11612f5fe1..febcc87ddfe1 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -2149,11 +2149,12 @@ static int dsi_vc_send_short(struct dsi_data *dsi, int vc,
>  			     const struct mipi_dsi_msg *msg)
>  {
>  	struct mipi_dsi_packet pkt;
> +	int err;
>  	u32 r;
>  
> -	r = mipi_dsi_create_packet(&pkt, msg);
> -	if (r < 0)
> -		return r;
> +	err = mipi_dsi_create_packet(&pkt, msg);
> +	if (err)
> +		return err;
>  
>  	WARN_ON(!dsi_bus_is_locked(dsi));
>  
> -- 
> 2.25.1
> 

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