linux-kernel - Re: [PATCH 2/2] drivers: input: mouse: alps: drop unneeded likely() call around IS

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Message-ID: <20190820111719.7blyk5jstgwde2ae@pali>
Date:   Tue, 20 Aug 2019 13:17:19 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     "Enrico Weigelt, metux IT consult" <info@...ux.net>
Cc:     linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
        linux-input@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] drivers: input: mouse: alps: drop unneeded likely()
 call around IS_ERR()

On Tuesday 20 August 2019 12:56:12 Enrico Weigelt, metux IT consult wrote:
> From: Enrico Weigelt <info@...ux.net>
> 
> IS_ERR() already calls unlikely(), so this extra unlikely() call
> around IS_ERR() is not needed.
> 
> Signed-off-by: Enrico Weigelt <info@...ux.net>
> ---
>  drivers/input/mouse/alps.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
> index 34700ed..ed16614 100644
> --- a/drivers/input/mouse/alps.c
> +++ b/drivers/input/mouse/alps.c
> @@ -1476,7 +1476,7 @@ static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
>  		/* On V2 devices the DualPoint Stick reports bare packets */
>  		dev = priv->dev2;
>  		dev2 = psmouse->dev;
> -	} else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
> +	} else if (IS_ERR_OR_NULL(priv->dev3)) {
>  		/* Register dev3 mouse if we received PS/2 packet first time */
>  		if (!IS_ERR(priv->dev3))
>  			psmouse_queue_work(psmouse, &priv->dev3_register_work,

Hello! Two months ago I already saw this patch. See discussion:
https://patchwork.kernel.org/patch/10977099/

-- 
Pali Rohár
pali.rohar@...il.com